Complaint

I am Albertha GJ Meyer from Kempton Park. For about 18 months we have Nepic Wifi. About the last 6 months Supersonic takes Nepic over and my wifi was fine, the 1st of March my wifi was slow and the 3rd of March my wifi is shut downed completely and is still off. I contacted them multiple times then they told me that they must replace the current router with a new router and told me they will contact me in the next 48 hours, days went by and they still didn't contacted me. I phoned them again then they told me that they ordered the new router, it will take 3 to 5 working days to come install the new router. It's a week later and I still haven't recieved my new router. I phoned them again today, they told me the delay is at LTE and that it will yet take another 3 to 5 working days. Every time they tell me they'll call me back but they never come back to me It's going on like this for the past month. I'm wanting urgently response.