Appalling Service from Defy, Wait weeks for Service.

Booked a service with Defy on Thursday 12/07/2018, was told a technician would contact me within 2-3 business days, no one contracted me. Phoned the next Thursday 19/07/2018 to ask what is wrong an why no-one has contacted me, after giving my reference number the lady told me that the matter will be escalated. Saw one missed call on my phone the next Tuesday, luckily TrueCaller showed it was Defy. They did not phone again since and this week coming ( Thursday 02/08/2018) it will be 4 weeks that I have been waiting. R800 worth of food down the drain already, living off a small bar fridge that my parents are lending me. What is a person supposed to do? Complain? Phone every day to remind them? The service I have received so far is literally nonexistent.