IPL Doesn't Work After 6x Treatment? (photo)

Dear Doctor, I had done 6x IPL treatment for under arm. the therapist said it probably take only 5x treatment and the hair wont grow. But after 6x treatment, my under arm hair still grow but it is getting soft and thinner. I spent a lot of money for the treatment and i wont do it again if the IPL doesn't work on me. Is it possible? and what should i do to remove the hair that still growing after IPL? Waxing or shaving? which one is the best? Thank you so much for your help.

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