Bad after sale service

My husband bought a Mobicell phone from PEP on 24 December 2018. On 16 January the phone gave problems with apps that did not want to open. Pep send the phone to Mobicell. On the 8th of February I collected the phone from PEP just to find out that the phone is still not fixed. When I turn the phone on it shows the Mobicell logo and then go to the home screen just to return to the Mobicell logo and the home screen again. The phone went like this till the battery died and that was about 5 hours. So my problem is this. I've bought a phone for R1400 and used it for 22 days. Needs it urgently for work (that's why I bough it because I need a phone). Already went in now for its 2nd repair. Already without a phone for 36 days. What happens to my guarantee now?