Discussed service

I called Discovery Bank on the 01 of July cancelling the credit card with them. I was told that someone will call me before end of the week to cancel, no one called me. I called again on the 14th of July. I was told that my call has been escalated I will be called within 3 days. Today is the 21st of July no one has called me. The service is terrible, even calling the call center you have to wait for more than 15mins on the line before talking to someone. Myself and my husband were to move the bank to Discovery but the unprofessionalism it's a no no. All I wanted was to cancel their useless credit card which has ridiculous bank charges every month but rather open a transaction account. With the treatment I am getting I am not sure if I am still interest in any of their products. I am not prepared to pay another bank charges this month, can someone please assist me.