Excise duty refund

Dear Experts, We are coming under the SSI manufacturing unit, we are purchasing our raw materials with in India along with Excise duty & VAT and we are sales our finished goods (Drilling Machinery) to exporters like 100% EOU & other exporters who's are coming under the EPCG scheme. now we are not doing any local sales but planning. Please be noted we are not having Excise registration position if we are eligible to obtain the refund our Excise duty & VAT which are collected from us by the way of purchase? if yes which way (or) from where we will collect the same (i) MEPZ (or) (ii) DGFT and as well as in future we will enter the local sales if we utilize the Cenvat credit? I request you to that reply briefly along with suitable Notification if any.