No answers on trouble with internet connection

Trusc ISP has no answers as to why our internet connection is so bad. We are Battlefield online players but can not play one single game without being kicked from the game with error 'check your internet connection'. According to the technicians at Trusc it is Battlefield itself. But it is Battlefield 3, 4 and Hardline and on 3 different pc's. You can't Teamspeak because you can't hear anything. We have reported this to Trusc for at least a year now but still nothing is fixed. Between the 3 of us, we have spend more then R6000-00 in airtime phoning Trusc to sort out the problem but no response. If you are a pc gamer do not consider Trusc as your ISP.