I want a sahiwal or gir cow 10 to 12 liter milk in 10 to 12 thousand rupees

That budget is too low for a genuine Sahiwal or Gir milking cow. For a healthy dairy cow, Sahiwal and Gir usually cost much more. If you want ten to twelve liters daily, first milk the cow in your presence, then do a CMT test on all four quarters, check which month of lactation she is in, and verify age and body condition. For a purchase above fifty thousand rupees, take a Pashumitra or vet with you. If you want, I can show you suitable cows to browse.