Service Tax Cenvat credit not c/f as opening Balance

Dear Sir,

we had a cenvat credit of Rs.650,000/- in the year 2014. But our Auditor was taken as opening bal. in the year 2015. So we can't file revised service tax return. So pls guide us how we forward that amount in the year 2016. and take the benefit. Kindly draft a sample letter to officer for allowing cenvat cr. of Rs.6,50,000/-