Was a structural engineer involved in this change? If you followed his/her specs, it was done adequately. If not, you may have a disaster just waiting to happen.

There's also the foundation under the post to consider as well. Was that dug out and reinforced, or is it just the plain basement concrete slab?

Just plain basement concrete slab.

Also, no structural engineer.

Replace the support posts immediately and get a structural engineer.

(4) 2x4's supporting a steel beam? In my opinion a recipe for disaster as you may have made your original condition worse......

Get a structural engineer in there immediately. Who the hell does stupid crap like this???? Unpermitted. Uninspected. Probably unlicensed and uninsured a well. Recipe for a home collapse and lawsuits.

Any history of the OP having asked here or other forums, prior to agreeing to this?

If they "under-supported" the beam, which they did, did they also undersize the beam? What size is the beam and what is the span? I had a beam engineered for our remodel. It was an 11' open span. 4x10x5/16" beam (rectangular not I-beam) with 4x6x1/4" posters. Welded at the top and a 6x18x1/2" plate welded at the bottom anchored to 24x24x12deep concrete reinforced footers. Now, I'm in CA and the ground sways occassionally. You need to back up here and pay an engineer to confirm sizing. At least call the contractor and ask him for the engineered stamped calc on this. mine was a T type beam. All welded steel at the top. One post was a 6x6 wooden post

I've never heard of supporting steel beams with wood. Concrete block and/or steel is the way to go and the load must be transferred to proper footings. The description of the existing work has "hillbilly" written all over it.

Wood has very high compressive strength and certainly can be used to support a linear steel beam which has the much higher tensile strength needed.

That being said, a pair of 2x4's sitting under the main support of a home certainly sounds like a potential disaster waiting to happen. I don't understand why anyone messes with the engineering of a home's main support without really understanding what is involved.

Get an engineer ASAP and please (!) report back with some pictures and findings.

Trebruchet...my house is built with steel beams supported by 2x4's designed that way..so it can be done..it was 20yrs ago..yes my house has proper footer under the 2x4 posts..one end in a block wall the other on 2x4's in the middle of the room. where the beam ends.

back the OP...get a structural engineer out ASAP..like other have said..
depending on the load demand a concrete floor(4"thick) might not be enough??

its all about area and distributing the load to not break something else

Wood is used under steel a lot, and engineer-approved. But you essentially make a beam pocket in a big built-up post so the steel cannot kick out or shift at all. And of course it must bear to earth and have a properly-sized footer.
Casey