Would you mind providing more information.What was the issue,was it Assured,did they offer a remedy,who was the vendor,who did you take to Small Claims and what was the result,how many do you buy per month.Just read G3 T & C’s and it clearly states they can reject anyone without reason.( BCA state if you take legal action they can cancel your account. ) .Normally when you buy at auction,the contract is between the buyer and the seller and the auction acts as an agent .