Debit order payment not processed and now they claim non-payment

I opened an account with Coricraft which is financed by RCS a debit order was arranged on the last day of the month but debit order did not go off and I called them to query this and only to find out that a wrong account number was inserted from their side because I wrote the correct account number on the forms. Contrary to this mishap I was called with a non payment claim and I explained to the call agent that this is not my mistake and notes must be written on the system because I do not want to be called for something I did not do. Another agent called to tell me my account has been suspended because of non payment claim and I had to explain again why it is like that and that I asked the previous consultant to write notes on the system so that I am not bombarded with calls, sms's and emails. It is the 3rd of October and I received an email stating that I should make payment on my account and my debit order went through on the 29th of September already. This is totally unacceptable!!! I wouldn't advice anyone to take any form of loan with this company the worst EVER!!