Is this an example of "voluntary termination?"?

I recently had a job that said I would be charged 87 dollars (for a drug screening and background check) if voluntary termination occurred. However, since I found another job and I found out that this was an extremely shady company to work for, I decided to stop coming in (in hopes of getting involuntary terminated or "fired"). I received a phone call from the company and did not answer it and recently found that I had been "terminated" via my online company profile. So, since I did not say "I quit," can this company charge me the money for the tests (was I voluntarily terminated?) Also, could I make a valid argument when I pick up my check by saying I didn't quit if it were the case?