DISCOVERY BANK MAKES PROMISES IT DOESN'T KEEP

I received a SMS inviting me to download the Discovery Bank App and that in return I would receive a R1,000.00 Woolworths voucher. I duly downloaded the App and was then directed to upgrade to a Discovery Bank account. I did so. A new credit card was delivered to me a few days later. No shopping voucher. I phoned and complained and was promised that somebody would call me back. I asked for a reference no. for my call but was told that they don't give reference nos. No callback. I tried to log a complaint on the Botchat, but it kept directing and re-directing me to various other pages which did not have a complaint facility. I am really fed up!