My contract cell phone does not make calls.

Hi, on the 31/12/14 my phone was blacklisted my Telkom by mistake they were training to blacklist somebodies phone since it was report ****** by they blacklisted mine, I have sent it for repairs for them to open my cell phone on 22/01/2015 and now they want me to pay for my phone to be opened but they are the ones who did a mistake and blocked my phone instead of somebody's phone. I need my phone back and I wont pay for it I sent for repairs on 22/01/2015 and its still not back when I phone Telkom they say still under investigation ever since yet they are deducting money from my account every month kindly assist me so I can get my phone back . Case number ***2 Cell phone number for this contract is ***. I can be contacted on ***. I am disappointed from Telkom service