Shocking Service(no Service)

This is the 4th time I am reporting this on hellowpeter since installation of a new phone for my mother in law in an old age home in August 2015.The phone is still not working correctly and Telkom keep telling me they have escalated the problem but nobody contacts me.This is shocking service from a provider who no longer cares about customers.All you get is promises and NO ACTION.WHAT DO I DO TO GET WHAT I AM PAYING FOR??????