After 30 days no progress

I signed a fibre deal with Supersonic on the 28/02/2019, they said it will take 7-14 days to be fully installed and working, its now 28/03/2019 a month later and not even a follow up call, I had to call in all the time, chatted to Hayley, she supposed to give me daily feedback which isnt happening, Supersonic is saying its on Vumatel side, which is understandable because Vumatel is useless but surely they have SLA's in place so that operations run smoothly between them, the problem is that I have to give in notice to my current SP which was supposed to be on the 25th, if nothing happens by 29 March 2019, I will cancel the application.