Unproffesional service and financial impact to customers

I contacted Weelee to sell my vehicle. After following all processess and requirements my car was put on the Weelee site for bidding. After bidding, I recieved an offer from one of the bidders. Based on this offer, I declined offers from other buyers as I was assured that the dealer/bidder could not withdraw from the offer. After struggling for 7 days to get my vehicle evaluated and prepared for settlement, Weelee informed me that the dealer/bidder was no longer interested after being assured this would not happen as all information was logged on their system. I have now lost all deals on my vehicle and will now suffer a financial loss due to this. This is incredibly unprofessional and making promises and not seeing them through is unacceptable. This whole experience had been unacceptable.