Aspire Credit Card issue

I’ve downgraded my credit card from a Private Clients to Aspire credit card account. Since then I’ve had endless problems regarding the new credit card. I try to do online transactions and it says that I have sufficient funds, when I do have funds available. I’ve wasted nearly R200 on phone calls with your call centre, my issue is escalated and nothing happens further. Nobody from FNB calls to check if the problem still persists. Your call center just escalates and nothing happens.

Please can someone with the appropriate credit card knowledge call me back to fix the problem! My name is Shevan and my contact number is ***.