Unfair Cell C contract

I went to upgrade my contract and I choose an OPPO phone.Since day one had problems.Went back to Welkom Goldfields Cell C.They refuse to give me a new phone.If I want to cancel the contract I must pay R12 000.They book it in for repairs and for 21days Im going to be without a phone.My clients cant contact me.Its a 5G phone and I dont have 5G where I live.Now I have to pay a device that doesnt work for 24 months.Why is it that the consumers is NEVER covered with this service providers?Now I have to pay a device for 24 months that does'nt work properly from the start and I cant get out of the contract for THEIR mistake.Today I will go buy a new phone cash and I don't have a choice as to finish the contract but cell c lost a customer.I will NEVER be so stupid as to be talked into a contract again.Cell C is costing me alot of money and is making my live difficult because there is no reception in my area and it is my problem.... they dont take any responsibility.I feel like reversing my debit order and just stop the payments.Their contracts is so unfair to the customer but THIS idiot will never be that stupid again as to be talked into a contract and be punished for 24months.😠😡Unfortunately we live in a era where the customer is paying for the service providers'mistakes and we don't have ANY rights if the mistake is on their side.We as customers are never covered.Why do we bother with contracts with this people that is so one sided that we as customers ALWAYS loose while they a making millions off us.