Meteor call problem

I know there have been posts on this before but I just wanted to get people's opinion on my situation.
I ported from vodafone to meteor (SE W800i) in mid December. For the last 2-3 weeks I have been having a lot of problems making and particularily receiving calls. On a regular basis when people try to ring me they get diverted to my mailbox and I get no indication that they called. If they don't leave a message I sometimes don't even get notified that I missed a call. Other times the notification does not come through until I go to ring someone and 2 or 3 could be built up at this stage.
When I do try to ring someone I often get a disconnection before the call goes through. This even happens when I try to dial my mailbox.
I have checked my diverts and everything seems in order (by the way what should my mailbox number be?)
By the way all this happens when I have full coverage

I have gone back to CPW and contacted customer care and all they do is reset my diverts with the #0002# code.

Has anyone else suffered this and have you been able to get it sorted out and how?

What are my options for getting out of the contract because I don't feel Meteor are providing a satisfactory service.