Pathetic customer service

I have a contract phone with MTN which is still under warrantee. The phone died 2 weeks ago and I took it to MTN Blue Route Mall on the 28th August for repairs. They booked it in to send to their repair centre and the consultant told me it takes about 5 working days to repair. I have no phone to use in the meantime and I use it for work. Yesterday 6 September I went into the store again, not having heard anything from anyone at MTN yet and they told me they didn't say 5 working days, because it can take up to 4 weeks to repair. What do I do in the meantime? I am using an old tablet with a battery that dies after 2 hours of use. I'm due for an upgrade in November, but I'm really contemplating letting my contract run out and switching to another network. The customer service at MTN is pathetic.