Slow Internet Service

I am paying more then R800 a month for a 4MG Telkom ADSL Faster Internet line. At the moment my internet is so slow I am unable to do anything. This upsets me, cause I am paying so much for a service thats not working. I am a teacher that does not make a lot of money, and now with this Internet thats not working the way it should, I am waisting more money. I have made many compaints with telkom, and still my internet is just getting worse by the day. They should have it on record. I am very unhappy, and would rather cancel everything and get DSTV....please just sort my internet out telkom then I will not complain.