Worst service EVER!!

I recieved a Mint Emerald on the 24th of April (after 10 days of contract, due to wrong address) On arrival, the phone is not working - screen freeze at startup. I reported it to the callcentre who told me it will be picked up within 5 working days. Its now a month later and still waiting for couriers to pick it up. every time I call, I get the same answer - It will be picked up during the week. It is now 3 weeks I get this answer, but still nothing happened. I already received the monthly invoice, but still no phone? This is the worst service I have ever received!! I am prepared to cancel this contract asap.