Internet problems for Virgin Media customers

When it runs in our house it's pretty fast but we should be getting 60mb/s and they've consistently failed us to deliver it , fairly recently they turned up at ours without a appointment and said they'd be cutting off the internet for us until we stopped putting disruption on the network , after asking about anything we'd done around the house that might affect it and being told we had cat5 cabling going to every room,up the garden they either wanted us to remove it or we could wait for them to install a new box that allegedly stops the disruption , took them 2 days to do so no internet without tethering my phone , no refund either

Funny, because I'm on the 60MB as well and it has been outperforming for the last few weeks