Telkom ADSL do not put it into your house

Upgraded my Telkom ADSL line from 4mps to 10mps and the speed never changed, paying for a 10mps line with 4 mps speeds and all Telkom says it is correct on their system, the technical department says they see it is still 4mps but the sales department keeps on saying it is 10mps, I am cancelling their service sucks.