BSNL Broadband
Too slow speed

My 750 plan has started from 1 dec.but instead of getting 256 kbps speed my speed is that od dial up that is 50 kbps and downloading rate id 6.48 kbps.i live in bikaner.while my uncle took same plan in jaipur and geeting speed of 256 kbps.wat should i do.i hv also complaint it from bsnl office but they cant do anything