You only have two options.
1.Robinair american 4cfm for 72000 rupees (rip off)
2.VALUE brand chinese. Various models.
1 stage 3.5 cfm is for 10-11k
2 stage 5 cfm (the one i have) for 16k
You also need vacuum oil for 3600 rupees. its a 3.6 liter bottle of robinair brand.
Get 2 stage vacuum pump if you intend to buy one and dont go over 5cfm otherwise itll cause compressor oil problems. 5 cfm can vacuum upto 25ton unit. 3.5 cfm is good for upto 10 ton unit.
Having smaller capacity will take more time.