Changing from vat to cot

Hi,

We are running a restaurant since Sep-2013. At the time of starting a restaurant we bought Kitchen equipments, electrical equipments, utensils from outside state. We are still using these equipments and utensils. We had applied for VAT then. Now from more than one year we have not made any inter-state purchases. Our annual turnover is around 80 lacs. If we want to convert from VAT to CoT now, are we eligible to do so? We had applied for the same 3 months back (after one year of our last inter state purchase) and our application was rejected.

Regards