My broadband speed is locked @ 3 mbps. Though my ISP changed the allocation in front of me from 8 to 10 mbps.

Hi, My ISP was meant to give me at least 4 mbps.

But recently it’s only 3 mbps.

I went to their office & they literally changed the allocation for my ID from 8 to 10 mbps.

Still I’m getting 3 mbps.

What is issue & how can I fix this?

( my ISPs networking knowledge is not that good. In some cases I know better than their workers )