Questioning Contractors Work.

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I manage a two story 10 unit apartment complex in Los Angeles. We recently had an incident which involved a drunk driver crashing into our concrete stairs.

I contacted a contractor and he offered to repair them for $1300.

I've been tracking his work and am questioning whether it's being done correctly. 

My question persist on the following:

Concrete steps/stairs are made up by a series of plywood boxes stacked in which you then pour cement into.

While reviewing the work done I noticed that the contractor made plywood boxes but then covered them with a flat piece of wood then added cement on top. A couple of days later I noticed that the layer of cement now has spider web cracking everywhere.

My question to any fellow contractors. 

Is the process he took to repair the steps correct and is the spider web cracking normal?