Worst service ever experienced

I took my ring in to be repaired but had to get a quotation first, after almost a week i phoned them to find out about the quotation instead of them phoning me. Then a week later I phoned to ask how far they are and the cashier said I will have it in time for my Engagement shoot...2 days before my Engagement shoot I phoned again to get an update, just to be told that my ring is still at the workshop and they will phone me by the end of the day to give me more information...well tomorrow is my shoot and I am still waiting on that phone call...I was told it will take more or less a week. If they knew it was going to take longer they could have at least told me,but when I asked if i will have it back by the 4th of November they were quick to say yes!!! What am I suppose to do now?