My hair are smelling so bad after hair botox.

I had gotten a hair botox done last year for the first time and was pretty satisfied with the result. Hence decided to get in redone this year with the same salon but the stylist was different. Now my hair are smelling like sulphur even after 2 washes. I'm distraught. Don't know what to do. Haven't gone there for confrontation yet. Is there any place I can complain about this hairstylist?? Please help.