re: Should I be Calling Plumber or Septic Tank Company Question

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Any reason I would prefer the original installer over another?

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Other than familiarity with the particulars of your equipment, no, unless it is under warranty.

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I don't think there's actually a pump in the tank. It's just a big tank in the ground to my knowledge.

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It could be, but a lot of the designs for these units I've seen have a settling compartment with a pump to pump it down after it reaches a specific level.

But yours could be designed to essentially spill out once a certain level is reached in the tank. If that is so, the perhaps your anti back flow is clogged or or the piping out. If it is an overflow it is gravity fed out, so if the tank sunk or even shifted to one side, it may affect the units ability to get rid of the water.