Cancellation/New Contract

I called cellc beginning last month and I was told my last installment on my contract will be at the end of March,all good hey,then I called beginning of the month and was told my last installment was end of February and when I asked the agent to cancel my contract I was told it wasn't 1 month in advance.Who's fault is that since I was given the wrong info?And I was told cellc will keep on billing me while they have blocked my sim since the phone was ******.Lokl.So I want to take out another contract and mapule hasn't been getting back to me since yesturday after sherr told me I have been approved and she just need me to supply her with my bank details.I called cellc 4 times today after being told to call 084143,084140 and 084145 and 084140 again but no one could help me and kept saying mapule will get back to me.Now *****ba tells me I can't apply for a new contract since I'm in arrears. I haven't skipped 1 payment snce I had my contracts.I'm really frustrated and I just had enough of the bad service I received.Please help.<br> Thanking you in advance