regarding food franchise termination, as no support provided by them

I had taken a food franchise and paid 2.5 lacs for the same, they committed marketing as well as operational support, but since day 1 we have been suffering due to them. the operational support (cook) provided by them took his salary and ran away after a month. this was 3 months back, till date me and my partner are running our outlet ourselves making the dishes, we just have one helper with us. all the staff provided by them ran away in a day or two. no marketing or promotional actvities were done by them, to boost the sales. our outlet is in kamla nagar,north delhi. even the raw materials supplied to us were at higher costs. Also the email provided to us has been suspended by them. now we want to terminate the agreement and start this outlet by our own name. they have sent us a termination letter which totally supports them. so need advise on the same.