Query regarding on depreciation

Dear, We are Paints distributor firm. We did purchase one weighing scale for sale purpose but when we purchased weighing scale at that time we paid 15% tax and we did not claim input credit and also with not showed part in capital goods but we had do weighing scale entry in fixed assets account. But at this time that weighing scale we are selling then customer are demanding tax bill from us. How we give bill to customer.