Account in arrears and countless phone calls

Account in arears. I am fed up with this company they are forever in my case.I made a mistake on the referrence that I was suppose to make when making a payment, with ackowledge that it is my mistake on the 02 Feb 2018 amount of R500.00.I made a call to Direct Axis and the consultant told me to forward her the proof of payment and of course i did.After several days after forwarding I made a call again, another consultant told me that it will uodate after 7 days and I should call again,I did. Around March I made a call and the consultant told me that she is making a note and she will hand it over to accounts department.I waited for their response and dololo no response.And I decided to reverse the amount paid on March payment,thats when now I h4ave their attention.They are calling me the whole day starting from 7 am until 7pm.The other day the lady called again and decided that maybe she can help me but she told me that she cant help me as she is not working for wesbank rudely ofcourse after I have explained my story aboout making incorrect ref number.And the other one called again as well the very same day of friday 06th April and told me that she is making note on the credit collection department. Now I am getting sms that I should arrange for payment as my loan remains overdue.Please help as nobody is hearing what I am saying.