Internet line speed not working

Ive been reporting my Internet issues for last two month and still to date my line speed cannot be resolved. I have had 3 technicians at my house already and still not resolve. They are bot able to provide me with a 4mbps line speed. It keeps changing and goes slower everytime. Im tired of having to call in an explain myself. I will cancel my line if this continues. The fac tthat its taking so is just un exceptable