Enough is enough cell c

I had contact with cell c for more than 6 years (3 upgrades) things were good. The last upgrade i had 4 phones and a Wi-Fi (5 lines). I took a phone for myself, mom, sister, dad and a wifi. After the 24 months i called in to cancel my line and i informed the other family members to do the same as we have completed the contract 24 months. 3 months later their phones are blocked (no Calls in or out) because they didn't call in for cancelation. At the time i was unemployed and i called in and the balance was just under R2000 they said i can not close those phones untill payment is up to date and i asked so that balance will not go up as the contract was done and it is on a month to month thing (meaning you pay for the minutes, sms and data month to month) i didnt want that option but because i was unable to close the account due to being behind cause of the other lines. I asked since the phones are blocked and you can not make or receive calls i am fine with making arrangements to pay that amount. Instead cell c is adding minutes and data to phones that they have blocked knowing very well those minutes and data the people of those phone won't be able to use them. As it was explained to me after 24 months you pay for what you use and i fail to understand why im i being charged for phones that are blocked, what im i paying for if i can not use the phone. Cell c blocked the phones and they adding benefits and charge me for it knowing very well i can not use them. I would understand if the phones where blocked and i was using the benefits then definitely i need to pay for it but in this case they blocking me and charging me it is not fair. I have sent emails dm'd on their social media and tried calling. I dont mind paying for the benefits before phones were blocked but after that i think its a **** to pay for benefits that you do not receive especially after completing the agreed upon 24 month contact. The balance as of yesterday went up this month again it is R6 000 now for benefits i dont receive, does this sound fair to anyone. All i ask is for them to tell me how much benefits i actually used and how much they will be i don't mind pay for the amount. I need them to close those account also once i make the payment of the data and minutes that i used only before the blocking.