CELL C CONTRACT IS A **** 😡

I phoned cell c requesting a settlement account for my contract fone, they sent me all the details via sms with reference and amount to pay and that was on the 23rd of October and I have paid on that same day, up to this day they are calling me saying I owe them money I've sent proof of payments to all the emails they gave me, Nosipho Mkhulisi even acknowledged the receipt of POP but to this day the fone non stop and even blocked my line, I spent all my airtime trying to figure out why my line was closed they opened it saying they have received the payment but today they called me 3 times already saying I'm owing them for 3 days I'm so ****ed with Cell c I regret taking contract with them and il never recommend to anyone