Unacceptable Service

I have an american express credit card that i got through nedbank, they recently charged me for a supplementary card that i do not have and they have been chargong me for payment protector insurance which i never signed up for, i sent an email to them and the lady called Pam Qoza phoned me, after probably a week and apologised for the charge for the supplementary card and said she will arrange for it to be reversed, she said she will get the consultants from the insurance department to call me, that was a week ago, i still have not heard anything, I find this level of service unacceptable, you always worry about ********* making ********** charges on your credit card but if you look closely enough its these credit providers that are the real ****** and if you search for answers no one responds as is the case right now...i regret ever getting this credit card because it has turned out to be more trouble than its worth...cant wait to have it paid up and part ways with this company :(