Fed health are sharks!

I am 21 years old. I started my medical aid in October and canceled it in the same month. I paid for the month that I started the contract in (October) and they told me when I canceled it that I’d have to pay for November as well, which I was totally okay with. I was retrenched in October which is why I canceled the membership, being retrenched, I was unable to pay for November and so it came off of my bank account and bounced a few days after. Come December (current month) they decided they would take off double the amount because I was unable to pay for November, so they took off for November and December. I’ve tried contacting them by email but the only replies I receive are that there is nothing they can do about it.