Line speed went from 8mb stable - 4mb slow

I've logged more than 2 faults to address the issue.<br> My line speed was set to 8mb last year (2014) as that was the supported stable synchronization speed.<br> Early this year i experienced a humungous drop in browsing time. images would take about 3-5 minutes to open. the only thing that was responsive was youtube & facebook.<br> <br> I am 200% sure that the line was synching at 8mb as it was confimred to me by 2 technicians and an internal connection. <br> <br> I logged numerous calls to resolve the line issue, it was told the line issue was resolved and is set to the best possible sync it can and will have had before which is 4mb.<br> <br> The line is now slower than it was when experiencing the slow speeds.<br> <br> Each time i log a fault now or try to get the line back to what it was i get told this is the top synching speed i would get due to my location from the exchange.<br> <br> This is funny because I'm still in the same house still connected to the same exchange.<br> Why is my line speed synching at 4mb instead of 8mb which it was before. <br> I have changed ISP's thinking that might have been the problem.<br> <br> Same issue on the first day without any throttling.<br> Please assist me in solving the issues and correcting the line?