DATA ERROR

I called and asked for my 5gb data to be reduced to 1gb. I was advised that since it was after the debit order run, they will still debit the R249 at that month end, but I will be in credit for the next few months and my account won`t be debited until the credit has run out. I was told that a 1gb of FNB data is R65. AT the end of that month they took the R245 for the 5gb data plan, but I only received 1gb of data. AT the end of last month they debited my account with R65. It was the first month after the excessive R245 was deducted, so I should have been in a credit. I was fuming and called them, The lady said ok, there was an error and they will REFUND the money into my back account shortly. That was well over a week ago, and still NO FLIPPEN REFUND!!!! Totally unacceptable!!! GIVE ME MY DAMN MONEY BACK FNB, or I will move ALL my account to another bank, and make sure that everyone knows what ****py service you give to your clients!!!!