Telkom slow LTE speed

Basically, no LTE. Every night I am getting download speeds of around 0.9Mbps. THAT IS 1% OF TELKOM'S CLAIM OF UP TO 90MBPS. What am I supposed to do with 0.9Mbps speeds? I have been logging calls wrt this issue and eventually promised that the tower will be upgraded (new tower), this is nearly a year ago. But Telkom will roll out fibre to the area next to us who still has copper cables. And our area Telkom refuse to reinstall the copper and also do not install fibre, forcing us to use an oversubscribed LTE. And over and above that I was holding on for the call centre for nearly 20 minutes (from my cell phone - due to above), and having to give up as there was no answer.