Where is the Support?

Currently we are not getting what we are paying for. We are paying for 50/50mbps but only getting 50/5mbps. Upload speed is very important for our conference calls and 5mbps is a rip-off. Nobody gets back to our queries about this. Previously in the year we lapsed in payment due to not receiving any notifications around a change in billing by supersonic. Only when *****ing an issue with our line did we discover this. In the last week it's been impossible to get hold of support, you wait in a queue and the call drops when you get close to number 1 in the queue. This morning I actually got to number one and heard the other person introduce themselves, then they remained silent thereafter, I could even hear a bit of background noise but they wouldn't respond for a about two minutes after which I hung up.