LTE, why so vague

We are prospective LTE customers after being with mweb for decades. We are considering LTE as our adsl lines are ******, Telkom issues dealt with through Mweb, yet despite reporting to Mweb no response as to when it will be resolved has been recieved. We found that Mweb dodges and ducks a simple question of forget up to 30 speeds as we want to know what we will get or what do you consider as a fair speed as up to is worthless. Mweb has a fair usage policy protecting them from being **********. But they dont have a fair product delivery policy so customers are protected. But we required to sign a long contract where what we will receive in terms of speed is vague. So if it's as slow as a snail they will duck and dive as they done with our ADSL speed issues and at one stage years ago up to 70 disconnection a day. Mweb we ask why you cant commit to what would be a fair speed which if not achieved would make your contract null and void. Please no dodging the question.