RCS/Game account harassment

So RCS manages my Game account. In Feb my debit order tried to go off before my salary reflected in my bank account (my debit order is set for the same day that my salary reflects, so I'm not sure how that even happened) needless to say the debit order returned unpaid, As soon as I noticed this I made an eft payment. Since that day RCS has been phoning me DAILY, sometimes even twice a day stating that my account is overdue and I need to make immediate payment. Now in April they still phone me saying that they have not yet received my March payment but the debit order did go through, the consultant then asks me for a proof of payment (clearly not understanding how a debit order works) The amounts they claim is outstanding doesn't even correspond to my statement. The account management is shocking and their phone calls are turning into harassment, If my account was actually behind then I don't mind the calls but it is not behind so they have no reason contacting me twice a day just for me to explain the same issue every single time. I would NEVER refer someone to RCS for credit or a loan or even to GAME, rather take a loan from a bank or similar Financial Services Provider because the harassment you need to endure far outweighs the benefits of this account.