Dissatisfied and enraged by the unfair treatment

Extremely disappointed and frustrated by the way Discovery has treated me regarding the medical aid application I completed/signed up for with them. Firstly they try deduct the initial debit order on the incorrect date which resulted in the debit order bouncing, then received a call from the call centre agent and made an arrangement that they deduct the debit order on the 1st of June but no debit order has gone through. Now Discovery informs me that my application is now suddenly canceled even though I've explained to them what had transpired (there's recordings to support that the error is from their side as calls are supposed to be recorded) but they just ignore my plea for assistance to resolve this issue.