POOR CUSTOMER CARE

I am so disappointed with Cartrack, I sold my car feb 2019 and on the 25 feb 2019 i have sent an email to Maria Sehlapelo(CLient services Dpt) for the change of details as the car was no longer belonged to me.i even provided all the details of the new owner to my surprise nothing was done and now Cartrack keeps spending smses that i have be handed Over to the Attorney's.i dont understand how the Poor customer service becomes my Problem.I feel harassed and i cannot take any responsibility for someone who didnt do her job correctly. Currently am unemployed and i have my own stress to deal with NOT with Cartrack Poor customer service. I provided all the details of new owner on the same month that the car was sold.I WILL NOT RECOMMEND ANYONE TO USE THEIR SERVICES BASED ON MY EXPERIENCE .I have followe up with the lady and months later still not sorted.how is that my PROBLEM