dj Problems - five days before the wedding.

Ugh! I am not freaking out, but I am freaking out.
We hired a DJ many, many months ago. He works with FH, but he and his friend own a business where his friend DJ’s and he MC’s. I was frustrated at first because he refused to draft up a contract for me, even though I asked multiple times. FH knows him relatively well and sees him daily so overall we were comfortable with no contract because he has been communicative and professional so far.
They DJ every first Friday at a local bar, so two weeks ago FH and I went to see them and it was baaaaaad. The DJ sat around on couches and walked around with the mic, ultimately not doing any real talking, was intoxicated, and spent a lot of the night sitting on the couch with his girlfriend.
I was slightly leery after that experience but felt confidant that he would not behave that way for our wedding since we ARE paying him. Fast forward to last Friday when he was talking to FH about details and he told him when he would arrive, and then proceeded to say “We will be there around 530 to set up, and then G will be there after to attend the ceremony and reception.” .....G is his girlfriend. Who is not invited.

I am livid. It’s just one thing after another and I am usually good to give people the benefit of the doubt but when I am paying you for your services do not try to take advantage of us.

I know now we should have gotten a contract and we have both figuratively kicked ourselves but how do we nicely tell him we are going a different route?!

Our wedding is NEXT Saturday. I have another DJ that I’ve found, thank goodness; but my FH is super non confrontational and is worried about having this conversation with someone he sees daily.