Very slow net and very high ping

I've always had a 2mb line with telkom, it was doing well and the gaming ping (which is what I mainly used it for) was playable. Then in the beginning of this year I moved in with my girlfriend. She had a 2 mb line as well but that's where it all started. Now that I started using this net I realized it was extremely slow and in game ping was way to high, deeming everything unplayable. The download speed was also terrible for the line. So then about 2 months ago we upgraded to a 10 mb line. Everything got worse from there. After a week with this "10" mb line I called tech support. Told them the story and that now I'm able to do even less. The ping went anywhere from 300 to 3000. I stress that they must make use of my cell number to make sure I am at the house before they come as the rest of the house don't understand tech too well so that we can discuss ways of going forward with this. Eventually a technician came but did not try contact me. I get a message o n my cell the the fault has been fixed. Go home to try it out and no improvement. Two or so of these happen, and I was told that one one the technicians made a comment about how I keep contacting you and there's nothing that can be done. Yet I cannot pay so much money while getting close to nothing. The morning after one of the technicians came I got a call one my cell from someone representing telkom asking me if it has been fixed. I told him no and I need someone to actually fix it. He tells me I'm wrong that that if everything on his shows my line works then it works and anything else is up to me. While I'm trying to respond he says "I got to go" and hung up. I think I tried getting I got one of them to phone me and he said he could see there is a problem the my physical line (underground) and that he would get it sorted out. Few days later I get 2 sms' saying my fault has been fixed and reply with 24 hours. Got home, couldn't even load a web page. I call again but insist they contact me before coming. The technician calls me we organise to meet that coming monday. That Monday morning he calls to tell me he is coming. I waited the whole day and Noone came. Now I sit with slow internet that we're paying a fortune for.