You say Duh, as if it should be plainly obvious you mean megabit. However you typed MB multiple times which literally means megabyte.Mbps, of course. Duh.
So by Duh you are saying I should just assume you don't know what you are talking about rather than give you the benefit of the doubt.
And if you have a commercial line and it's governed by an SLA (should state to what degree and how often they can fail to meet guaranteed rates) that they are not meeting, then it should outline the remediation. Typically they would owe you money back on the cost of the service, possibly owe you additional money if you can show the lack of them meeting their requirements impacted your business.
If there is no SLA and no contractual guarantee of service then there is literally nothing that can be done except hope they decide to upgrade their equipment.