Poor Service

I sold my car in 2015 September and then never did the change of ownership immediately. Which resulted to my account being in arrears. Which I settled last month. In October I then called Tracker to inform them to call the guy I sold the car too and do the change of ownership. But till to date they never did.<br> I am still responsible to pay the Tracker which not under my Ownership anymore.<br> <br> Can this be sorted out immediately as this has been going on for over 3months already.