Credit Card payment

Good day, sometime in February I called Standard Bank call centre due to being over charged on my debit card and the agent I spoke to failed to explain to me I then asked her to change my debit order day which wasn't changed until I received another statement for March, I then called again and spoke to some lady who also failed to explain the statement and transferred me to some Manager's by the name of Theo who change the debit order day and apparently the was a "budget transaction" on my account which I had no knowledge of, which I was charged an interest by Pick n Pay I called now and spoke to Zanele who's telling me to take the issue with Pick n Pay I asked to speak to the manager and she said the manager ( Gugu Maphosa ) wasn't around and kept me on hold for 15 minutes then came back sting her manager can't speak to me