DSTV Non Payment

I cancelled my subscription with DSTV because it was not working and I was not getting any assistance from them. Am now receiving sms's from their lawyers asking me to pay them, this is confusing for me because I don't owe DSTV. I called them last month and they promised to listen to their recordings and come back to me. It's more than a month now waiting for their call, can they sort out this issue with their lawyers because I don't owe them.