16% of the promised performance

My ongoing battle with Telkom ADSL continues. After buying a 10Mb/s line speed with unlimited internet access for home office use, I have had a permanent battle to get the ADSL service I pay for. After finally getting a competent technician who fixed the line outside the house, I now have intermittent success at a maximum download speed of 1,6 Mb/s. Even considering that I must be sharing speed, this does not come close to what was promised. No one responds to emails. Can't get through to the call centre. I even app**** to buy a faster line at 20 or 40 Mb/s and no one responded. At least LTE has competition that drives some service.