Shocking customer service - the INCOMPETENCE!!!

I have experienced thee worst service from you guys over the past 2 months. My contract ended at the end of September and every week since then my phone keeps on being locked and every time I call I am told that I owe the company - after the explaning that I dont it gets activated until the following week. In addition to that my name has been sent to debt collectors stating that I owe money. This will affect my credit score and up until today this has not been resolved. I have a statement received from you, confirming that I dont owe you a cent. Today 1 Dec,my phone has been locked yet again - it has been 4 hours and I have made numerous calls with no help. This is actually my last resort before I escalate to the Ombudsman. I have never experiences such incompetence. This is actually SHOCKING.