You shouldn't be expected to perform treatments you are not qualified in, especially something like brazilians, as a lot can go wrong with that.
If I was you , I would really stand up for myself and stop performing any treatments you are not qualified in. It's not fair on clients and what if something goes wrong? Who will be to blame then?
I was once put in a situation like this, while I was studying for my level 2, I went for a job interview, got the job,the next day I come in and the owner tells me I am booked in to do a full body massage (which I wasn't qualified in yet as that's a level 3 treatment) .So I said I can't do it as I am not qualified in it and he said I either do it or I can leave right now.
No need to say I left and never went back. I didn't want to work for someone like that.