Payment Dispute between Sub-Contractor and Roofing Contractor?

Payment Dispute between Sub-Contractor and Roofing Contractor?

How do i get payment from a roofing contractor if they dispute the the invoice? The problems is that i received an order for an item of works on the Wednesday in which the value would of meant that i lost money. So i quoted a new rate and discussed this with the roofers CM and agreed to carry out the works. I didn't receive a new order because the roofing contractors were at a conference on the Thursday, was hungover on the Friday and the job started on the Saturday. The CM now has no recollection of any coversation and says he never received a revised quotation and will only pay the original order. The value is nothing spectacluar but the principle of the matter is eating away at me. Is there anything i can do? such as adjudication or arbitration? A valuable lesson has been learnt.

Thanks for your time.

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