2 weeks is really not long enough to see results - but as you said there was a deeper infection by the looks of it so you would have needed antibiotics as well.
It can be applied too much - but i did in my first month apply it once a week - voltan was really bad ( i would never do once a day), then reduced to two weeks and so on until i apply every 6 weeks.
My vet would never have known what it was but he was amazed with the results.
Only case i have seen not work was for Odin - he had photosentivity (only his white sock). Cleared this up first and he has pig oil and sulphur since with no ill effects
So while he has no swelling ect is it worth giving it a few weeks untill i get new vet out??