Promisses no performance

I've been an IBurst customer since the early days. I went from usb modem to telephone modem to the biggest 2Mbit modem. Since I can't go faster than the 2Mbit modem I just renewed my contract. For the last year I noticed a drop in speed. I used to download at 180 Kbit/s but as of late some days I only get 20kbit/s in afternoon and some time during the day up to 80Kbit/s. My modem has been in the same spot for all the time. When I phoned them a month ago they told me I must move the modem around. That was not a very satisfactory answer although I tried to move it in vain. I then decided to get an outside aerial to boost the signal. I phoned on the 5th of June and they promised an technician will come to my house on Monday the 8th of June. They promised me the technician will call me. I waited whole day for Mr. Nobody. Every time I call they just say the Technician will call you. Early morning today I called them again and AGAIN they made promise. Phoned them like 10 times. No help. They don't even know where the Manager is. Every time you want to speak to him he's not at his desks. No wonder it's falling apart! The management is missing. I've got 2 months left. Bye IBurst!