Stop debing my account as contract ended.

I had signed for 3 year contract service with Mix Telematics for tracking device in August 2017 and contract expired in August 2020.However this company keeps on debiting my account even though i notified them that i do not need their service anymore after the contract expired.I keep on telling them to stop debiting my account but they still continue debiting .As results i decided to reverse the debit order.The also listed on ITC .Telematics please stop debiting my account anymore and up date ITC because we do not have a contract anymore .I dont loke this company anymore as thry dont listen and they even handed tme over to attorneys LGR attorneys.I told their attorneys to take me to court since they claim that i owe their client (Telemetics) money.Its been more than 4 months Telemetic attorneys harassing me .I am so unhappy with this company and i wi ll never do business with telematics again.