very very very slow internet

i had a 2meg adsl line installed last year and have not once for nearly a year now received even close to 2meg,if i do a speed test i get .4kps or .7kps not even half of what i pay for.if talking to a telkom consultant they say that the adsl line is not a garenteed line and that the contract states that i can get up to 2megs,so i upgraded my service to a advanced package which is a 4 meg package now my unternet is worse and slower after numerous fault reporting a telkom technician came to my house and spent a whole day trying to solve my problem, still excactly the same, the verdict is my internet is slow because of the distance i stay away from the exchance approximately 6 kilos which makes sence but why didnt the consultant that sold me the sevice explain that to me,maybe because they dont know their own products or maybe they just dont care. so my question is isnt telkom in breach of contract by not supplying what im paying for and can i just cancel this contract and explore other options maybe lte