Can't cancel subscription

I wrote off my car in June of 2019. I emailed them in August after seeing I'm being debited requesting my account be cancelled. I only realised a couple months back (start of lockdown) that I'm still being debited. All efforts to call and email (website form) have failed, yet I'm still being debited. I stopped the debit orders and now I'm being invoiced penalties (desipte not being on contract).

A very rude consultant did contact me a week back and said "she'll see" - but now I'm being harrassed with invoices by the finance department.

So basically in Lock down I can be invoiced and penalised, but can't speak to anyone about getting my account cancelled.