Poor Customer service

I was foned from CellC head office that I qualify for an upgrade on my contract and they send me a samsung A30s.... Had the fone only for few weeks and the camera flash didn't want to work... It was send for repair on 23 September 2020 and till now I am paying and waiting for the fone to return... Contacting their repair section and hold on for almost an hour... Try contacting them again and now response......... What do you do in this circumstances........ VERY VERY DISAPPOINTED