The worst service I have had for a long time. I ag...

The worst service I have had for a long time. I agreed to transfer to Plus net but I got 4 MBs line speed as measured by Which. I tried to cancel to go back to BT, all agreed as I thought only to find Plus net un-cancelled me so I have to continue to work at home on 4 MBs and cant activate my BT broadband.. I was getting 18MBs from BT before. Plus net won't answer the phone and tell you that you're not even in a queue they just wont answer to help. So awful.