Direct debit is not being taken, paid manually, now I can't use phone

I recieve a text saying payment is late and log into the app where it says the direct debit wasn’t taken.

So I pay manually, which is all cleared within a few minutes.

It isn’t giving me the option to add or change direct debit, even though my banking account is fine (paying other things with plenty of money in there so should be working in the first place).

An hour later I try to call someone and it instantly forwards to a customer payment helpline saying that I have called the number even though their records show that I’ve paid up to date.

So now my phone isn’t working and I have no way to resolve the issue.

I also don’t have the option to resolve this next month when I assume this will happen again?