Disgusted by their service

I reported a damaged phone at Monitor Administrators which is under Unlimited and claimed and received a replacement phone around the 20th of May and within a week I find fault and reported the issue and they collected the phone on the 4th of June 2020 and they said they will assess it and they did. They said the phone is not faulty and I asked them what happens if I find that it still faulty and they said they will take it back for assessment or replace it. I waited and waited after they said the handset passed the assessment and I was supposed to receive the handset within 21 days and only to get it after 30 days. I monitored the handset and told them that there's still an issue. I took screenshots and recorded videos for them to see and and even removed the screenprotector to test if maybe it might be the problem only to find that no it's not. So now I have to buy another screenprotector when i get a phone back. They said they will send me a loan phone that I don't mind but I cannot wait another 30 days while they are 'assessing' the phone. People from Phonefast collected the handset on the 11th of July 2020 and today (the 20th of July 2020) they said "Please be advised that unit was received at the repairs centre it currently in a que for assessment next follow up will be done on Wednesday apologies for all the incovinience." which means I am still gonna wait probably more than 30 days this time around. This service is unacceptable at Monitor Administrators when i was claiming they said they have only 2 phones(iPhone 7 Plus 256GB and iPhone 8 64GB(which is the one that's giving me issues) and my cover is R11 000, So now maybe they have more options for me.. Can they give me another phone except for this iPhone 8 64GB.