Bangalore cab woes

Was going to Marathahalli from kempegowda and it was 9 pm at night took a cab ..he told me to pay ₹1200 first then started making lame excuses like toll tax and waiting time and rush hour traffic and then told me to pay ₹ 1700..I had no choice because he didn't speak a single word in hindi or english and it was late at night and had to pay the inflated fare..feeling fleeced.