DSTV strikes again ....bad service and worse telephone manners

Despite a cancellation in services of more than 8 years already , the accounts and sales departments of DSTV keep phoning me telling me that they are busy with my account to upgrade and more Honestly this call comes thru 2 to 3 times a year and worst of all when I politely say to the person on the other line my subscription was cancelled more than 8 years ago there is a silence and then they just cut the phone off , no sorry or apology ...I think DSTV sales staff should be schooled in basic manners and customer phone calls training Its shocking how they conduct their calls and accounts