Horrible online sale and after sale

I bought a Samsung on line and I explained to the guy who was assisting that I want to use my number, it must not change, to my surprise when I got the new phone it come with a new Sim card. I called the after sale call center and they said I need to cancel this contract as there is nothing they can do about it. So I called the after sale call center to cancel said they will arrange the courier to come and collect the phone. But still no courier come to collect the phone. 2 weeks has past, so know i called them to find out when they will come and the after sales call center said, there was no arrangement made to collect my phone on their side. She said she can see I called but no arrangements to pick up the call.. This is the worst service. I have had control phone before and I have never experienced such horrible service.