Hi all my company is doing PT works for a commercial complex and recently we found that there is an increase in quantities for beam and slab area so we submitted a formal letter explaining the actual situation with reconciliation of the bill.But the main contractor rejected the bill asking us to give mode of measurement of this part if the codes provide for the same or back it up with details of any similar other works wherein these areas were measured and certified for payment.Plus he has included a escalation clause in his letter saying that the claim for the price increase has to be backed up with proper documents like purchase vouchers etc.Earlier when there was price increase you were paid and if the prices come down the benefit has to be given for the client.Moreover he says that WCT is not applicable for subcontractor according to the local law.Even we are not eligible for the service tax.But when we approached the lawyer he is saying that we are eligible for service tax and has given a letter.we are planning to produce it to the client.Now i referred the fidic 2005 for subcontracting work clause 13.1 states that work can be varied only by the way of contractors instruction and the subcontract variations may be initiated only by the main contractor.Guess nothing is favorable for sub contractors?Kindly advice how to take it forward?