Paying for 4mb/s - receiving 0.4mb/s!!!!!

I recently moved house and had to have a new phone line installed... I spent SIX hours A DAY on hold with Telkom Call centre trying to resolve my internet problem as I had no internet for 2 weeks!! I work from home so I could not do my job. Finally internet was connected... but although I am being billed for 4MB/S internet... and have to pay the bill or else get cut off... I am only getting 0.4MB/S I have reported faults only to receive sms's saying the problem is fixed. I still cannot perform my job adequately and have absolutely useless internet which I must pay R1000 a month for!!!