why you want people to contact you with their stories - surely it's your story which is important, so let's stick to that.
You used a debit card, which was unwise, because if things go wrong you don't have the protection that would automatically be yours, had you used a credit card. Having said that, you are certainly protected by consumer law - up to a point.
You don't say whether this computer was an off-the-shelf, stock item, or whether you specified the configuration, so Panrix could build it for you. It makes a difference, so perhaps you could clarify that point for us?
You say that you ordered the computer at the beginning of April, and that you made a refund request two weeks ago - which would have been less than three weeks from the date of order. Why did you request the refund? You say "I was very disappointed with their service". In what way were you disappointed? Three weeks isn't an unusually long delivery delay, so perhaps there was some other reason?
Are you aware that, under current the distance selling regulations Panrix have thirty days from the date you requested the refund within which to refund your money?