Phone contract with Vodacom

I bought my phones at Game stores in Groblersdal both of my phone are a contract from Vodacom, my phones are Apple iPhone 12 since the day I bought the phone they have been having a crashing issue,both of them so I complained to the store and explained that I use lots of petrol money to go to Game stores in Groblersdal since I'm a bit far from the place, I even complained that why are they even crashing because they are still new , they told me it was a factory fault and that I must bring them back for some fixage I did exactly that after a few months the other one crashed and I called complained again they told me to call Vodacom of which I did and I was tired to do, I stopped paying for the account because I cannot be paying for something that the store cannot fix for me , they blocked both the sincerest and both phone which was very low for them to do so after the other phone has died completely, it has been dead for 8 months and I haven't paid a cent because it is very tiring to be paying for something that is not even helping me ,the phone died and then im expected to pay 1050rands for the phones each month but they are not working that ain't fair and I won't be doing to my self, I then called vodacom explained the issue that im having regarding both phones ,they told me to go and give back the phones so they fix them it is really tiring doing the same things every after 2 months and im expected to pay an amount that only benefit the store and still drain my personal life, I use close to a 1000 for petrol going there imagine if I have to go there every after a month to pay for something and then have to pay for the account? The store decided to send me lawyers so I can settle my bill i asked them why must I pay for something that I do not gain from and is not even working that was the last time I got a call from them ,I sent tons of emails and then they send the robot tobi to reply to our emails what a joke and what kind of some games is vodacom playing with their customers? I need to get the phone fixed and settle for my bills but how I am going to do that while the store doesn't put an end to the phone crashing issue?