Iwyze insurance

I had an insurance with them with policy number ***, I called them and cancelled the policy on 2022, March and April 2023 they have debited amount of R1036.49, I have made a complaint on them they are saying the policy was never cancelled by me it was only cancelled by them due to non availability of funds in my account, can I be assisted to get my money back as this has cause a financial constraint and left me with areas in my bank. I have called and cancelled the policy with them they never cancelled the policy. I've cancelled it even today still I haven't received a letter confirmed that the policy has been cancelled