Read your own post at the top specifically the bold portion. Wanstalls never claimed to have submitted the rifle, so who's the liar then if CANAM did submit? You're the one who is claiming that both parties submitted the rifle..
M+M has nothing to gain by honouring either dealer as no product has been shipped or paid for. From a business perspective it would be in their best interest(and apparently in the best interest of their investors) to side with the dealer that was offering the rifles at the higher price, or in this case not disclosing a price at all. Burning Wanstalls to achieve a higher margin is just plain business. Wanstalls tipped their hand and now the dealer wants shuffle the deck.