The main thing that hasn't helped with this is that I can find no letter where he was notified about his billing changing from quarterly to monthly and nothing on the new invoices states they have changed and are now monthly, they look identical to the old invoices, so it was only when 'yet another' bill arrived a few days after we'd just paid one that I started to look into it and found out!
He's found it not easy to make a payments either as the automated phone payment option has been removed and while the invoices state you can make a one off payment online - I was going to do this on his behalf as he doesn't use the internet, I find I can't do this unless I create an account which, I believe, will in turn, stop his paper billing.
- I've been going to the Post Office to make payments for him, not ideal in the current situation. And even more so now I find this is going to be a monthly event rather than it being quarterly. I will look into making bank payments from my account in future when we find out what he owes but again this is not an ideal solution.
We currently don't know how much he owes as none of the amounts on the bills don't quite match up, I guess as they were not updated with our payments before they were sent out. Have tried to telephone up a couple of times but could not get through and yes, he got a threatening letter about adding £20 to his bill too. Its not like we haven't been making payments of trying to pay its just that there seems to be no simple way to do it without him signing up for a direct debit.