Hello again Auds930,
I previously advised that you should read up about the Consumer Rights Act. There are slight differences in the way the Act applies in Scotland, but I believe the relevant sections in your case are effectively the same.
The way you purchased the caravan which was unseen, actually strengthens your case, as you were not given the opportunity to see the goods you were purchasing to be able to check their compliance with your contract.
You ordered a "new" as in a brand new caravan, which means it should be perfect - no exceptions, so the faults you have identified clearly show the dealer (who is the seller) has failed in one respect of their legal duty under the Act .
Where a product is faulty, and had legitimately rejected by the customer under the terms of the CRA, the seller is liable to recover the faulty goods with the minimum of inconvenience to the customer. That means the seller is liable for any transport costs to recover the caravan - not you. That is part of the commercial risk that retailers have to accept.
Based on the information you have supplied to the forum, I believe you have a strong case to reject the caravan and to demand your full refund.
Its a real shame the seller seems to be ignoring your calls and messages, however and whilst I'm not disputing the accuracy of your reports, the seller may reasons for the way they have responded, but that should not include blatant lies that Damian has pointed out.
Keep a record of all communications you make (even failed calls)
DO READ UP ABOUT THE CRA and if necessary take professional advice on how to proceed.