Complain to Ackerman's connect and payjoy

I bought a phone at Ackerman's connect with payjoy September of 2024 Samsung A15 so on the 6 th of November 2024 the phone the just went blank so I sent it back to the store so that they sent to repair,they booked on the 8th of November 2024, no feedback,no phone calls no email instead I m the one going there every week to check the phone,so yesterday they called saying I must pay R5000 bcos the phone might have a physical damage Which they're are not sure wat is it,so is fair to pay R5000 after 3 months without response on the other side payjoy is wanting me to pay every week for the phone that is on repairs and pay R5000 ,this people are full of **** the taking people for granted,I won't pay R 5000 for the That phone instead I want my money payjoy is the **** same as Ackerman's connect