Poor internet service

When i started with rocketnet, everything worked like it should. Now after a few years, my 300/150 line only gets 11/7, it constantly looses the internet and I'm fed-up with poor service. At the best my internet only gets 150/100, very poor as I'm paying for a 300/150 line. I hear that Afrihost is a good option will switch after the new year as there is currently a backlog