Poor contract explanation

I am very disappointed with how these company works i joined a service plan with them and i paid my premiums well and then i sold the car so i cancelled contract on 16 aug 20 of which the premiumwent through as the letter says i need to give them 30 dàys to finalize it.come sept the debited i reversed October debited i reversed and emailed them why do you keep on billing me they say i ve open claims.firstly when i joined the contract their agent told me i can cancel it anytime of which i did in August. Their agent didn't tell me these is a use as pay. Now i requested the audio of call recorded they cant give me but when i joined they said i can get it as soon as i request it