Payments demands

I cancelled my subscription with DSTV about two years ago and one of their consultants called me to say i have an outstanding balance of R100 and i settled that even send proof of payment.

I started receiving calls from DSTV consultants almost everyday asking for the payment to be made and i explained to a number of them that the payment was made and they all say to me that they will escalate the issue but i still literally receive calls from DSTV almost every day .

I really feel harassed for R100 , this is really unprofessional from DSTV, to make it worse it calls from different consultant every time . I wonder if this is how DSTV does its business ? I really need someone to assist with this , hope DSTV themselves will call and sort out this.