Monthly payments still being deducted even after request to cancel Tracking Unit

Good Day,

I installed a tracking unit on a Mercedes Benz reg DV 76 MD GP in August 2015. I sold the car in February 2017. Matrix notified me with the below email through a Credit Controller by the name Patience Ntsangase on 29 June 2017,"

Kindly note that your cancellation request was received on the 08.02.17, and we rep**** to your email with a settlement amount of amount R999.00 on the 27.02.17. We have not received the settlement payment that is why the account is not cancelled and we still billing your monthly installment. Our trackers are on a 36 months contracts, after 24 months you can request to cancelled we wont charge any settlement fee, however when requesting to cancel before your contract reaches 24 months then you have to pay a settlement amount before we cancel. If its not paid then we do not cancel and you are still liable for the monthly payments untill your contract is 24 months."

I took the option of monthly paying the installments and we are in October now the debit orders are still going out. My wife called and spoke to one lady who said the money will keep going out for the next 6 months.

My query is the tracker has reached 24 months and as was said in the email above by the credit controller, after 24 months then no cancellation fee is required and also the tracker can be cancelled.

Kindly assist with you expertise if i am wrong to say any money that has been deducted after August 2017 is a breach of the contract since August marks 24 months.

My Name: Gerald Makedenge Matrix Ref Num: 650055