I have several friends that have cancelled orders for various things not computers but book and record clubs. Like yourself although they had cancelled their contract the companies still insisted in sending goods. When the goods arrived my friends wrote to the companies stating that they had cancelled their contract and that they whould not be paying for the goods. They also informed the companies that if they did not collect the said items by a nominated date the items would become their (my friends) property. The companies never did collect the items and my friends still have the goods. I myself was in a similar position were a company failed to collect an item but still kept sending me bills. They even threatened me with a solicitor and court action. I then wrote to the company telling them that as they had not collected the item by the nominated date I would be charging them storage costs from that date. The result being that they collected the item within a few days and also agreed some compensation with myself. Hope that this may help your situation.