Credit card : invalid...

Today I transfered money to my credit card. I went to a store this morning and my card was declined. I kept the receipts as proof as I cannot understand why my card was rejected. One of the receipts says invalid card number. I regrettably had to leave the items at the store and walk out because my bank had a issue. I transfered more funds to my credit card but until this hour it shows zero balance. I then this afternoon received a sms to say that my credit card has been exceeded however my credit limit is under R100 and I transfered more than that to my card. I called the credit card division and have a reference number I was told I need to speak to credit card collection department and they cannot call me back. The consultant also told me that there was changes made to my limit, when I enquired who, she could not answer me and referred me to this division Please take accountability. Assist you clients and make the funds available and my card active please. Nothing warrants otherwise