Requested Cancel ADSL, and Telkom terminated everything (landline)

I requested Telkom cancel our ADSL service as we have moved to fiber. We then noticed the phone no longer worked -- and later got an SMS asking us to provide details to refund our credit balance. I wanted to keep the landline. But now I must contact 10210, but without at landline, it seems that MTN only uses airtime (not minutes) for calls to 10210, and purchased airtime disappears quickly when on hold for ****** ages. Is there any *other* way to get attention from Telkom?