Alterations nightmare

I'm freaking out and need to share with people that can relate.
I brought my wedding gown to David's Bridal in early Aug for my first fitting, more than 6 weeks before my wedding. I was supposed to go last Friday for my second fitting but they called the night before saying it won't be ready and could I push it out another week or two. Seeing as my wedding was two weeks away I said I couldn't do that. After a lot of back and forth we rescheduled it to a few days later in the evening and they assured me it would be done. I had to wait over an hour for my dress because they were still working on it though they told me it was just being steamed.
Here's the nightmare, the dress that was originally loose on me was now so tight it wouldn't zip or button all the way. I couldn't move my arms. Again a lot of back and forth about the timeline to fix it and what needed to be done. We agreed that while I was there they would let it out, let me try it on again and if that fit they would alter it and I'd come back on Friday. Well, after they let it out it didn't feel any looser and now there was gaping in the front. They made adjustments and 'will make everything right' but honestly I'm not at all confident than when I go back on Friday it will be ok. It's nine days before my wedding and I might not have a dress to wear! 😡😩