Telkom is a complete *********** disaster!

Telkom sends SMS and warns you to switch you off. You have to select expensive fiber (I do have already). They do not call back. They do not respond to mails. I call them but they are totally ***********. I need a line for my 93 year old mom (she cannot handle cell phones). Anybody knows a good VoIP provider who can manage number port? How can I get rid of Telkom? Must one go to these shops or is there another possibility. I rally have enough of Telkom "non" Service.