extremely bad service shouldnt even get a rating star at all

I'm battling with closing my RCS builders store account i have settled the account on the 27th of July, followed up with phone calls to please allocate payment and close the account and they failed to do so, i was then told to forward proof of payment to *** which i did on the 6th of august but still my account is not closed, i keep receiving calls for not payment every 7 days and debit orders which i have restricted i keep repeating my self over n over again, i sent a follow up email on the 1st of October to '***'; '***'; '***' with no response and again to '***' on 9th of October still no response.it is now going for past 3 months now, how difficult is it to close an account. it should be as easy as opening it!!!