Discovery does not deliver on service

I received my new Credit card from Discovery after my old card expired. They sent the card and I was instructed to activate it online. I use the card in-store however I'm told my PIN entered is incorrect. Discovery did not inform me the PIN had changed at any point. I immediately email the card division asking for assistance. I only get a reply on email 3 days later. I can never to to them via telephone as they are forever 'experiencing high call volumes\<br> <br> I reply to the emails they send but they are not helping me. They say someone will call me 'soon'. 1 week later and I am still awaiting.<br> <br> I have other Discovery products that I used the discovery agent directly. He cant help me either as I need to contact the call center. <br> <br> I am unable to use the credit card hence loosing out on the Vitality benefits linked to the usage of the card.<div><br></div><div><em>(Supplier name changed from Discovery Vitality &amp