Service tax on material used in service providing

Dear All

Our one of the vendor provides us maintenance facility.they are providing monthly bill in which the material cost & service charge are not separated.They are charging VAT on 75% of Rs 50,000(which is fixed bill) & Service tax on total amount i.e, Rs 50,000+VAT. I want to know whether VAT can be charged without mentioning detail bill of goods used? Whether service tax is chargeable on complete bill amount if goods used in providing service is not separately mentioned.

Please help.