My Phone has been blacklisted for no apparent reason

My Phone has been blacklisted for no apparent reason. All payments are up to date. I have emailed the un-blacklisting department with all required forms with no feedback in over a week. Upon trying to follow up via all possible channels I am simply told they cannot assist, where after I was requested to submit another request. I have submitted the second request with the same result, no feedback. In the meantime I am paying for 3 contracts, none of which I can use because the device is blacklisted and not just the sim cards.