2 months of paying without being able to use wifi

Since December 2017 we've been having intermittent connection issues with our wifi...signal comes for a few minutes then it's off for ages. Have called Telkom numerous times (20 plus minute hold even when calling at 9pm). Each operator does the same "system optimization " yet nothing improves. We were promised a technician would come out a month ago...despite following up constantly we're still waiting. Meanwhile their prices have increased and we're paying for a service we can't use.