Poor ADSL service!!!

I'm experiencing poor connectivity - download and upload speeds. After waiting almost an hour the technician recreated my port which made things even worse. I've logged a fault on the my telkom portal and after 3 days i get told we've investigated and your line is fine, call 1020 if you experience any further issues. I'm paying for a 10MB line and only get 3-4MB/s download speed. There is a 150 - 200 ms ping on my line, my line attenuation is 345dB downstream and 199dB upstream. These figures should be below 100. The calculation is 13dB per 1km of cable so it works out that i'm basically 30KM away from the exchange. How is this possible??? No one can explain or does any effort to get this sorted. During the day time my service is ****! and not to say practically unusable. I understand \up to 10MB/s"but jeez paying so much money for a 10MB line and you only get maximum 4? I'm a guy who always pays his bills"