I've the same problem as you OP and according to CS they can't reset anybody's IP Profile. So tried to find out how I could get it changed but before I could do that my new modem went again. Eng out on Monday.
I think it's worth pointing out that on FTTC the IP Profile is set by the Openreach DLM, not the ADSLx BT Wholesale one.
It's quite possible that CS have no simple way to affect that other than (on all except TalkTalk) reporting a problem to BT Wholesale, and I would guess few there know much about it.
As IP Profile is set by the sync, not the other way round, and the OR DLM seems to update it effectively immediately, it's unlikely that resetting IP Profile is a need. It's the sync that needs addressing.
Zarjaz's reply to andyboygsi seems to cover it - the engineer replacing the modem needs to check the sync and sort that out if necessary, though how you get it sorted if he doesn't is another question.
We can only know what the sync is if we are one of the intrepid users who have swapped out the OR modem, precisely for diagnosis of this sort of problem.
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