Having major problems trying to get a RAN to return my N900, anyone else not getting a response?

Phone was attempted delivery last Friday, picked up and signed for on Tuesday. Doesn't fit my requirements, as I've got to have better sat nav, and it's bulky. And the contract is too expensive to justify these shortcomings. So according to their return policy I can send back within 7 days of receiving.

Every day I've tried ringing the 0845 number but no answer. I emailed them Wednesday, Thursday, Friday. On the Thursday I rang Nokia Retail in Newbury. They couldn't help and gave me a direct MPD number. This went to the shop floor, the guy who answered said he couldn't help cos it wasn't faulty. Said the only way I can get an RMA is to email them. He said he'd email them too. I rang T-mobile on Thursday too to notify them of the situation and they made a note on my account that MPD were fobbing me off, as evidence if needed later, but as it's through a 3rd party they couldn't cancel the contract.

Still no responses....and no answer on the phone this morning.

Anyone any suggestions?