Wesbank Out of debt debt cancelled without my knowledge.

Hi peter, i bought a car from westbank financial services in jannuary 2016, iv since been insured with hollard insurance untill september 2017,the reason i cancelled my insuarnce with hollard insurance was because west bank added a additional amount of 600 to my installment saying that the reason is,i did not send my insurance policy in time to them so they could update my details on to their system. I called numerous times to find out if they had updated but the was no, my installments still had the the extra 600 added to them,i therfore contacted hollard insurance to say that i cannot pay for two policies anylonger for one car.they therefore cancelled my insurance from their side and i continued to pay 600 for ODP (out of debt policy) with wesbank. Earlier on this year february 2018 i sent an email to them asking them to stop their policy as i wanted to join my way,i had joined my way and sent them a copy of my policy with my way. I never recieved any communication or whatseover from wesbank stating that they have cancelld their ODP policy,so therfore i continued paying the same amount i was paying for my car installment and ODP at wesbank. In the month of march miway started to deduct money from my account,i called in and stated that can they please halt their policy as im still waiting for wesbank to give me confirmation that they have cancelled the policy from their side as i cannot pay for two policies on the same car. I was recenntly in a car accident and when i called wesbank to verify my policy with them and to also make a claim,they said my policy was cancelled way back in the month of feb and therfore they had not recieved my ODP policy installment. On my statement it shows that iv been paying the same amount for my installemnt and ODP which is 4000 for my installment and 600 for my ODP, wesbank then continued to say that on their side it shows that iv been extra money for my installments...! Wesbank does not have evidence of them communicating to me that my policy was cancelled and as a client I should’ve been alerted so that I could’ve continued my insurance with miway...I would further like to know which steps I should take in order for my problem to get resolved. thank you in advance