Under reverse charge st liability discharged by sp instead

HI, My client(Pvt co ) has availed Security services from an agency ( Sole prop) from the year 2012 since then the agency has been raising the bill on my company for entire service tax portion and we have been paying him the amount. The security agency has been remitting the amount towards government . Recently during Excise audit , Superintend of Excise had pointed out that 75 % of service tax portion was to be paid by service reciever under reverse charge // Now my query is Will the company be treated as in Default for not paying 75% portion or can i argue that Service liability for 12.36% was paid by service Provider Kindly advice 

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