As the saying does, never be a customer, only an investor in reliance. The promised speeds are bullshit, customer care is bullshit. I live about 50 m from a tower too. The image will be below. Heres the 3.1 mbps Im getting.
Ive never gotten speeds above 1.5 mbps for the 6 months Ive been using it, and it never lasts for more than a day after you pay the bills. My usage isnt very high either. And when they sell you the unlimited plan, be careful.
Unlimited means, you only get your speeds up to a certain limit, then it goes haywire and gprs speeds will be higher.