Bad management of customer account

I have been a customer of DSTV since 2011. I moved to Randburg in 2012 as an employee of Multichoice upon which I changed my account details from that of an external party to an employee. I also upgraded my decoder to a PVR and app**** for insurance and updated my details. All my account billing was done internally prior to receiving my salary. I left Multichoice in 2013, to this day my account is incorrect- the decoder was never updated to PVR, my insurance was never activated, they are claiming I owe money for box office from when I was an employee but that is not possible because I had the employee debit order taking all balances owing at month end