Airport cab scam

Just had a horrendous experience with a cab at Surat Airport. The Scam: I was quoted a reasonable price for a ride to Rander, but upon reaching my destination, the driver demanded a whopping 700 Rupees! Parking Extortion: To add insult to injury, he then slapped on an extra 150 Rupees for "airport parking." I'm not sure what the actual parking fees are, but 150 seems excessive. Feeling Ripped Off: I ended up paying to avoid a confrontation, but I feel completely ripped off. Has anyone else experienced similar issues with airport cabs in Surat? What are the legitimate fares for a ride from Surat Airport to Rander? Any advice on how to avoid such scams in the future? I'm hoping to warn others and prevent them from falling victim to these dishonest practices