Erroneously upgraded to a new credit card

<p>I'm (ID NO. ********** 736088) currently having a platinum credit card which has been erroneously upgraded to a private client credit card, this happened after I tried to increase my limit online and I then immediately called FNB and I was told to write an email to ********** to date I have written countless emails without any success but Instead I'm getting numerous calls that I haven't paid even though I haven't recieved the statement from the correct credit card account, I called again I was then told that they can help me to lodge a complaint but till todate I haven't received any help</p>