Cancelled insured still debiting the account and refuse to refund me

Good day, kindly assist with the problem I have with this insurer,my name is Mojabeng Motetesi id no ***,cell no ***, I was initially insured by pinnacle marketing when i first took in the insurance, in 2017 i lost a handset Samsung A5 which it was replaced hustle free by them and i informed them over the phone that i no longer need insurance due to financial problems i had then,In December 2019 i was going through my statement when i discovered that i still have an insurance that is still active i started engaging with them only to find its Adymntec that took over and i explained my case, Lebogang was the agent then she advised that i email them id copy,claim form,OB number,Tax Invoice and ref no 374147,she asked me if i want a replacement or refund i said a phone and i waited for a respond,since then i have been speaking to over 11 different agent sending me from pillar to post ,promised to call back and some of them hang up while i am talking to them and not even once i was called back or given a feedback until today i decided to call again i spoke to Sphindile who said to me they need a proof that i cancelled the insurance,my respond was i did it over the phone cant they pull records of it i can give them an estimated dates according the the first claim i initially had and she insisted that i give them a written proof mind you this thing happened in 2017 and they have been debiting my account every month i then felt been powerless and ****** off my money i asked her to cancel it over the phone and she did just that ,after she was done with it i then asked her if they can cancel this insurance now over the phone why would the want a written proof for the my query if they could do it over the phone and demand the impossibility to prove my case,how is this different from what i told them i did when i cancelled.But i decided to take them up with your help if i could i would attach all my communication with you in short this is the below info i sent them,Please kindly assist me from this ******s My story goes like this, I Initially had insured my previous Samsung handset with pinnacle marketing insurance broker whom they replaced with a Samsung J5 in 2017 June ,and I was asked if I would like to continue with the insurance which I said I no longer going to continue with it and that it should be cancelled, To my best knowledge I was under the impression that the insurance has been cancelled until last year December as I was querying my itemized bill I notice insurance is still deducting from my account.

Mind you I didn’t even claim for my SamsungJ5 because I knew I had cancelled the insurance, its almost 2 years now paying for the service that I had cancelled and now that I have been paying for it I would like to claim for a replacement or refund in this regard.

Your assistance will be highly appreciated.