We sold a gas log fire (eneded 31 days ago) seller picked up a few days later and paid cash - they were very happy with the unit, we described it as the model number that came with the operating instructions we got it with (picture is the same on the front of the operating manual so corresponds in my eyes!) and we advertised it as needing a clean as it's been sitting in the shed for 12 months.

Now these buyers have just phoned us tonight to say that they want some money refunded as they've had to spend money on the unit.  They are upset that it's not natural gas (we didn't specify what gas it was as most are LPG and every other serious bidder actually contacted us and asked) but again we just said it was gas - didn't specify LPG or Natural.  They said they had to put a mantle around it (how the hell is that our problem?!) AND they said they've pulled the logs out of it, added pebbles etc (again - how is that our problem?!) - but clearly they've modified it.  Now i should mention they've also installed it. 

They are trying to tell us we've sold them a different model number but what they are giving us sounds like a seriel not model number (so obviously different!!!)  We asked for a picture of the so called model number to prove that it doesn't correspond with the manual we sold it with and thier response was "what do you want that for?!".

Where do we stand, they paid cash, as far as we are concerned we sold the unit as is and as described.  I think they are just upset as they didn't look into what they bought before bidding (carrying onto my husband that we sold them a 20 year old heater.... - um we NEVER specified age - only model number!!!) and they've had it for a month and obviously done modifications to get it to thier liking and install it - so who knows what they've done to it! 

What reprocussions does this have for us (if any?)