Policy sold to me with recorded proof

I contacted Discovery Call centre and equired about a new policy and benefits as I needed urgent medical attention. I told the sales lady about my condition and that I needed medical attention. The sales lady 100 % confirmed me that the procedure can be done after 3 months on the policy. I have proof of this! We joined and after 3 months my claim was rejected immediately and Discovery said my policy does not cover this procedure!! I am now in pain and cannot work anymore to support my family. After numerous attempts and calls my problem is still not solved. Please help. The recorded sale voice proofed that the sales lady said that my procedure will be paid.