Harassing stroke patient ..who does not hold an account with company in question.

I am an elderly stroke patient ,thats on chronic meds.I have been inundated with calls from the above company requesting information regarding an account with DSTV,which i explained to them several times i don't have any outstanding monies or an account with them,and they acknowledge but call again and again. i contacted DSTV and they have no idea of me owing them any monies and confirmed that this is probably a **** call and i must disregard these calls, however these call are a nuisance. This company has no good practices in place, and absolutely useless ,harassing a sick individual with no sense of having any morals and ethics. Especially an individual who does not have a current DSTC account. Please my advise to you out there try and avoid using these people as they have no idea what they doing...........