Received cancellation letter 2 November 2020 and clientele still taking my money and neither I or the bank can reverse the transaction.

Good day, on the 2 November I phoned to query the policy as I had no information, no policy documentation, no member number if something had to happen. The only email I received was this cancellation letter which I accepted as last correspondence. I received another email 3 December saying something about policy changes and I rep**** to have my email removed as I was no longer a client. No one contacted me to correct the misunderstanding. Today the money is taken out of my account again and my policy is cancelled as per email sent to me 2 November 2020. Please reimburse my money you took off my account. I did not budget for this, and cannot reverse it myself, neither can the bank help me. I honestly feel this is theft. If I had clientele legal, what would they have done about this? The point is I received a cancellation letter 2 November 2020, no other correspondence, so policy is cancelled. GIVE ME BACK MY MONEY!