Internet Connection Problems

So three weeks ago i reported my Internet is faulty, they didn't get back to me so i phoned again to then find out a technician has been out but could not fix the problem and they had to send a group of technicians to fix the problem because it was on the exchange. This past Sunday i get a call from a technician that wants to come take a look at the problem, unfortunately there was no one at home so in Monday morning i get a call from the same technician to find out if its fine to come out. He was there for a while talking on the phone with someone and told us that the problem was caused due to us being throttled and there no other problem.So i phoned them again to report the fault again, apparently they sent another technician out today but the problem is still not fixed. I need this to get fixed ASAP because we are running two businesses off of this Internet connection. If it is not fixed ASAP i will take this further. Thank you.