My guaranteed BT speed is 50. When I ask BT to check my speed it is 50. Why is it that other speed checkers put the speed between 28 and 33? How can you prove any of it?
Post the stats from your router and also btspeedtester diagnostic results or speedtest.net
remember the speeds quoted by BT are connection speeds not download speeds. No ISP guarantees download speeds
speedtests must be done wired not wireless
you need to use a wired connection otherwise the problem could simply be your poor wifi conenction in your home due to home interference which is customer problem to sort out