mobilization advances. In pursuance of the said request, a meeting was held between the representatives of the Appellant and the Respondent on 27 and 29 September 2012 and at the said meeting, the Appellant again requested for giving Rs.2 crores as advance against the existing bank guarantees. In response to the requests of the Appellant, the Respondent gave three demand drafts of Rs.50 lakhs each and again of Rs.76 lakhs i.e. total Rs.2.26 crores against the existing bank guarantees. Thus, the Respondent gave Rs.2.26 crores to the Appellant against the existing bank guarantees. We, therefore, find considerable substance in the submission made on behalf of the Respondent that the Appellant having obtained Rs.2.26 crores against existing bank guarantees which were initially given by the Appellant towards mobilization advances, it is not open to the Appellant now to turn around and to contend that the bank guarantees could not have been invoked on the ground that 7.5% amounts from the R.A.Bill nos.1 to 18 were already deducted/retained by the Respondent.