Sad old Custer by Netstar unwilling to help

I've been a netstar customer for many years, never ever wanted to drive a car that's not covered by a tracking system. Anyway I became very ill, foot amputation, leukemia, enimic, legs have gone lame and eyesight deteriated, I now get injections in my eyes. I sold my car to we buy cars as I needed to due to financial constrains,i live off a sassa pension. I phoned in several times to ask for assistance in canceling or some form of help but nobody ever calls back, I even have names but won't go there. The car is being monitored in klerksdorp(kanana) I live in cape town but must foot the bill every month for a car I don't own. They send me messages that they got a distress single I think it's called, they don't call back when you don't answer, how do they assume you haven't been hyjacked or worse. I really thought they would have a bit of sympathy for my situation I find myself in but it's always sorry that's our policy, we can't change it, but you can cancel but then you must pay R2800 to clear last outstanding months of the contract. I do understand about contracts but surely it can be looked into due to my circumstances which can all be proven. Michael ***