Telkom bad service

My mom who is 91 has a pay as you go (Waya Waya) phone we live in Boskruin Randburg the phone has had no network for 3 months if we take the phone to Telkom Cresta (the most unfriendly staff) the phone work coming back home it does not, we have reported this problem over and over. No one wants to come and see what is wrong. The phone has in access of R200 airtime. I work from home and I can only use my cellular phone I work for Sasol LTD