Returned debit order

My Discovery Health premium was returned for October. They sent me an email to make a deposit into a Discovery account. Which i did and sent through proof of payment. On the 1st of November they go and put through a double debit of nearly R 10 000. So the debit order was returned again. I had only enough for one debit order which was correct. Phone them today. The proof of payment I sent through was not acceptable enough. Why did no-one contact me to tell me this. And is Discovery going to re-reimburse me bank charges for the double debit which was returned. Gross incompetance