Debt collection for non authorized account activation

We dont have a DSTV account and we have been handed over to debt collectors for outstanding fees. DSTV have themselves acknowledged the error is on their side when doing a system upgrade which automatically re-activated an old account. For 2 years now we have been harassed by debt collectors and spent 1000s of rand in airtime trying to get to the correct people within DSTV to correct the account. Every call person takes ages to look in to the complaint only to come back and confirm everything we tell them and that they agree it is their fault but nobody can fix it.

Why should I continue to go out my way to clear and fix something that has been acknowledged as their own fault that they seemingly cant fix on their own side.