Charged for Diagnostic test but no errors found

I recently took my girlfriends Opel to Supa-Mac Durban rd Bellville for a diagnostic test. Not being able to figure out the issue myself I thought this would be the correct course of action. The diagnostic machine produced \old\" readings which were cleared. R400 later I was left in the same position as to a couple of minutes before the test. I then took the vehicle for another diagnostic test to which I was asked for the year model and the mechanic had a look at the Vin number. This was not done at Supa-Mac. 2 errors were picked up..."