Credit life policy substituted but i am still being charged!!!

Kindly assist me urgently...i cant get ahold of you ,been holding for hours on the phone.

I have a credit card with you( Account number ***) .September 2019 I requested to substitute my African bank credit life insurance policy on my credit card with my YALU credit life Policy ( policy number YL-GDYBMG) and I received the acceptance letter dated 30th September 2019 confirming that my YALU credit life policy was accepted. However I recently thoroughly checked all my credit card statements and noticed that I am still being charged for credit life policy on my credit card. I am being double charged!!!!...I humbly request you to refund me all my premiums and stop charging me for the credit life policy as I have proof that my request was accepted. I really hope my request is going to be attended to urgently without me involving/seeking help from credit ombudsman. I know my rights!!!!!