poor service from absa bank regarding their technical glitche

I have personal loan with Absa and my account is debited on the 25th of every month. 26th April: I received a phonecall, email and sms's stating that my account was in arrears. I decided to call the collections divisions and they stated that I did not owe anything and that it was a technical glitche. The calls, messages and emails continued until I decided to escalate the matter. I was given a reference number and I was informed that the query was resolved which is a blatant lie. I am sick of the harassment from Absa staff members. I am also irritated by their lack of interest in resolving this matter. I have been emailing Absa support to inform them that the query has NOT been resolved but no one responds to me (this is the same email that told me the issue was resolved). It has been 8 days of harrassment from call centre agents, emails and sms' and I am ready to change banks. Absa keeps telling me that they have "escalated the matter" but no one gets back to me.