Poor treatment because R20

I have been with ABSA for years and have had multiple products with them over the years including a check account, credit card, vehicle finance and various personal loans but I am very disappointed in how they treat loyal customers.

I recently made a POS purchase at a local Spar. The transaction went through even though there was not sufficient funds in the account (R20 over). I was surprised by it because I usually switch over to my credit card when funds run out. No problem. So I just assumed once my salary comes in it would be rectified. I don't have an overdraft facility and don't want one.

Anyway so ABSA decided to bombard me with phone calls asking me when I will rectify the R20 I owe them. Are you being serious? I have been a loyal customer for years and if you checked my account history you would have seen that my salary will be paid into my account in the next 2 days. It's a disgrace and I am really considering moving all my accounts over to another bank if this is how you treat your clients.