bad experience

My contract ended in January and no one bothered to call and remind me or check if I was renewing instead they debited my account on a month to month basis but they are no longer protecting my car,no more phone calls when battery disconnect,i found out that contract ended when I called to check why am i not getting calls anymore from them,i reversed feb and march debit order their collection keeps calling me everyday that i must pay,what am i paying for because we dont have contract,i have made notice to cancel that contract but i dont want them debiting me