I feel like cancelling my Cell C contracts !

My d/o didn't go off in March as there was insufficient funds in my acc, I phoned the call center and asked for CellC's banking details so that I could pay that outstanding amount asap. The lady gave me the details and said that I had to use my cellphone num as ref when making payment. on the 1st of April 2015 I did a direct transfer from my cell and considered it done. On the 10th I received an sms saying that my line is suspended due to my acc being in arrears, I phoned the center again and the lady told me to fax through a POP & I did, she also said that it took about 3 days for the payment to be allocated. on the 15th I received another sms saying that I need to pay my acc or I'll get a bad credit record. I freaked out so I phoned the center again and spoke to a lady & she gave me her personal email & told me to send POP via email & I did. On the 18th i got another sms saying that my acc is still in arrears. I went into the Blue Route cellc and spoke to Zahier, he helped me and sent my POP from the store. on 26th April my payment still didn't show &I went to Blue Route again & Zahier helped me again. Now my debit order hasn't gone off for the SECOND TIME and I am really upset.