Wrongly billed and line suspended

I bought my phone during the month of November 2015 and was told that since it was the middle of the month my bill will be prorated nd send end of December 2015, Well I did recieve my bill end of December 2015 which was suprisingly skyrocket high, i then called the call centre to find out what coul be the cause, I was then told that that I have 2 lines in my name , which i didnt understtand as I took one line, I was advised by the call centre agent to go to the shop where i bought my line as he cannot assist me , I went to the shop and they also confirmed that I have two lines which one was cancelled the very same day i took my line as that was an error made by one of the sales consultants, the lady told me she was lodging a case and my matter should be resolved in 7 working days, after the 7 working days lapsing without hearing anything from them I decided to reverse the debt order as I felt they were in breach, The second month they still debited for 2 phones still, Last week they send me a message telling me they suspending my line I called the callcentre and some lady reasured me she will lodge the case and my line wont be suspend... TODAY MY LINE IS SUSPENDED PLEASE HELP!!!