Dissatisfied customer

Hi team I have an acc with standard bank vehicle finance which I have never dishonored. I received an SMS on the 1st of March stating that I owe them R2982. The next sms's followed on the 2,6,7 &11th of March on the other hand it was constant calls from the 3,5,6,7,8 & 12th of March regarding the shortfall that I have stated above. This was so unbearable I had to go to my bank to request a bank statement. Like I said to the callers I did not skip payment the proof was now in black nd white. On the 13th of March I then emailed Oratile and requested him to call me regarding the matter he did not. I anxiously waited for std bank follow up call regarding the matter but no one called. On the 7th April I took it upon myself to call them. Their employee by the name of Sandile Nene told me that the acc was up to date it was probably an error on their side. That's when I lost it they harassed me with calls and sms's and then they picked a mistake from their side no one bothered to call me and apologise for the emotional trauma that they have caused me. Are they so high and mighty that they can not even send me one simple sms to apologise? Is that how they treat loyal customers? Sandile told me that he will cascade my concern to Ms Lerato Mokitimi who will contact me in the bank's behalf that did not happen. Till now I am still waiting for a call from their side. I find their customer service leaving a very bitter taste on my tongue. Trust that the team will intervene on my behalf. Regards H Koahela