If BT answer it will just be that they are price rises to keep up with increasing costs. You aren't going to get any detailed breakdown as to why they have risen. As others have said you are wasting your time and money asking and as already shown it was in the Ts&Cs. The best you can hope for is that they will let you go without penalty but as that is already the offer there is no additional benefit to you.

The reason the call centre people couldn't give you an answer is there is no answer that would satisfy you and they aren't involved in the complex calculations that BT will do to balance costs and prices - they just answer the phones. And BT won't give much away as anything they say could be used for competitive advantage by other ISPs.

Energy suppliers are not allowed to increase prices during fixed price contracts. I see no reason why broadband and phone suppliers should be allowed to increase prices during contracts.

Because there is no law to stop them and Ofcom haven't made any requirement to do so - Ofcom have taken the other route of giving people a get out of jail free clause when prices go up.

I shall REPEAT, I was not given ANY terms and conditions by any means.
There is a radio advert running now.
The offer is Fibre Infinity for £29.99 (the same as I agreed too.
All that it takes is to phone BT.
I doubt the operator on the BT side will speak of all these so called terms and conditions (20 etc) as mentioned in another post.
I would like a poster to state the above terms and conditions were given verbally.

Regarding the waste of a letter to BT.
Once I receive an answer/explanation.
I shall write a letter to the CEO of BT AS A SHAREHOLDER AND ASK HIM FOR AN EXPLANATION AS TO THIS PRACTICE.

In reply to a post by ian72:

Because there is no law to stop them and Ofcom haven't made any requirement to do so - Ofcom have taken the other route of giving people a get out of jail free clause when prices go up.

Yes indeed, my point was the lack of consistency in the government's approach to utility pricing.

In reply to a post by helpoort:

I shall REPEAT, I was not given ANY terms and conditions by any means.
There is a radio advert running now.
The offer is Fibre Infinity for £29.99 (the same as I agreed too.
All that it takes is to phone BT.
I doubt the operator on the BT side will speak of all these so called terms and conditions (20 etc) as mentioned in another post.
I would like a poster to state the above terms and conditions were given verbally.

Why are you shouting at me? I haven't been criticising your actions.

My post you replied to was laughing at the content of blfamily's post . Read it!

In reply to a post by Michael_Chare:

Energy suppliers are not allowed to increase prices during fixed price contracts.

Because they are advertised as fixed price contracts. Only TalkTalk advertise fixed price contracts, so only TalkTalk is obliged not to increase their prices during the contract.

ΔWe may change any prices and terms during your contract. If this affects you, we'll tell you about important changes in advance, and you'll be able to end your contract without any fees.

You sure that the operator/sales person did not slip this in. Very easy to miss a short line line like this at some point in a call.
I have to read longer one's and we still get people calling back saying they did not have them read. Call monitored and it's clear as day that it was read out. People tend to turn off.
I make a joke that you do not have enough time to make a brew before starting

Ask for a copy/script of the call

Putting it politely. You don't really seem to have any idea as to how businesses operate or how they generate profit. You also appear to fail to understand that you didn't enter into a fixed price contract but rather a contract for a specific discount for a specific length of time. A contract which by no stretch of the imagination have BT broken. Further you have the right to cancel due to the underlying price having risen.