No reimbursement by the company for motor accident claim

My motorcycle met with an accident. The incident was reported to the Insurance company, the claim form, filled up, the vehicle surveyed and a claim estimate was submitted to the company. The vehicle was fixed and I took delivery by paying the full amount. After all the documents were submitted to the company for reimbursement, I was told that only a part of the amount would be reimbursed. I contested the Insurance company settlement procedure on the grounds that I was never given a copy of the claim estimate. The company says that they are not responsible for this. Please advise