I pay for 10 meg line and only get 3.75meg

I upgraded my adsl to 10 Meg from a 4 Meg line price deference is big but i only get 3.75 m/s almost worst than my 4meg line i had report it and they say there's a problem so can the problem be a month long and when u try to get hold of them u Wat almost an hour on your phone to get hold of them then they cant help you after that hour telkom is bad and they breach there contract to us the clients and if u Miss there payment u are in trouble by credit bureau I'm tired off company's like them lying in there own contracts and the service is bad get people that understand us