Cell C please be fair towards your clients

I have a contract with Cell C everything was fine till last year they double deducted my bank account without my permission or even informing me.Like any other person I went to the bank everytime they double deduct to reverse 1 payment.In December last year my contract was due for an upgrade,I went to the branch in Hemingways East-London where they call for approval but I was declined due to the reversals they said I must pay 3 payments first then go back after they 3 payments I went back but I was declined again this time they said I have 3 accounts that I'm not making payments on and I've been conducting Cell C poorly.I went there 2 or 3 times but had to leave the store without a cellphone.In January and February they deducted an amount from my account yet they declined me which makes no sense.The contract simcard I lost in December 2016 and few months thereafter I went to the branch in Vincent Park where the lady told me I didn't make a payment I told her the payment went through that day in the morning she said it's not reflecting and I must return the following day.I never went back because I stay far from the malls and don't have transport money everytime.In December last year when I asked the consultant if I will be getting my monthly benefits he said no I forfeited it.I just feel that Cell C's service towards me was very poor as their client,a valued client of 4years!!!