VM contract problems

My current contract was due to end on the 26th November.

I called up 3 weeks ago to say I wanted my service to end on that date. They took it a 30 days notice which took me to the 24th and they said they would refund a few quid due to the 2 days difference.

Fast forward to yesterday and I called to re-new with them. (I was hoping I could get GigaFast but its not ready yet)

I went for the M100 and phone vs M500 that I am on now to save a little bit of money. Thats £33 per month.

Today I log in to my VM account to see something shocking.

The new contract is not from the 24th but from the 18th Dec! Meaning I am getting charged £69 for my M500 connection from now till the 18th

What on earth are they playing at? Is there something I am missing here?

Going to give them a call tomorrow and see if I can sort that out but would love some input from you guys about this.

I can PM you the CEO/Exec team to look at.

Only had VM for a year but their first bill was not what was agreed on the phone. Tried to get the over payment back as a lump sum but was told they couldn't do that and the over payment would be spread over the first 12 months. Not ideal but was sorted with one phone call.

I managed to get back on the phone with them today and got it sorted.

Person I spoke to said she was confused as to why the other rep started the new contract next month vs right away so she changed it for me no issues.

Got £33 credit on the bill bringing the due amount for next month down to £30.

Back on track. How odd that the other rep did that.