What are does the ISP do to increase speed?

[bloodline76]

Someone on the O2 helpdesk has increased something their end to hopefully get my internet speed faster but the speed has decreased.

I would have thought it would have become unstable rather than decrease the speed?

Any advise for when I call them back? She is friendly enough but admitted to reading from a script.

THanks

 

[bloodline76]

Its ok she did it the wrong way and increased the noise instead of decreasing.

Bless her.