Non payment of complete salary after completion of notice period

I tendered resignation on 24/6/2013 with 1 month notice as per company rule and continued to attend office to serve period. A letter dated 10/7/2013 given to me in office on 11/7/2013, by hand, which mentioned that resignation has been accepted and I stand relieved with immediate effect (24/6/2013). They paid me only notice pay ( Basic salary) though I am entitled to get full pay with all allowances for the period 24 June - 11 July 2013. They denied to pay with reasons that I did not come to office. No such system in office was to keep record of attendance. They are taking advantage of this.