I have been trying to close my account for 3 months now

I have been trying to close my account for 3 months now. Every time I call I get re-assured that it will be closed, however this never happens. I am frustrated and will seek to escalate the matter should it not be resolved soonest.

I paid up my account on 16/04/2018 and requested closure. We are at the very tip of July, I waited the "compulsory" month whilst the account is frozen, and ensured the account is on a 0 balance. It honestly cannot be this difficult to have an account closed. Against all my wishes, they do not want to close my account. Seems very very wrong.