How do I send a NO instead of a quotaion to a potential client

Hi guys:

I was asked on 22 June to provide a quotation for a 23rd July wedding. I did just that. I heard no word from the guy (apparent wedding coordinator of sorts). On thrusday he calls and asks for the quotation (yes I was stunned). I informed him that it is in his inbox. He then asked for samples and queried the cost telling me that the bride's budget is $JA40,000 and that is the include travelling. I quoted JA$52,000.

I told him that if she wants to stick with her budget then she should reduce the the sizes and number of cakes as well as go easy with the detailing.

On Friday her cousin calls asking if this is Teneisha. When i identified myself she said i am so and so and you are doing a cake for my cousin. I advised her that i am not doing a cake for her (no confirmation nor deposit received) but that i provided a quotation. She asked if she could see me today which I agreed to.

When they came they wanted this and that and I was royally annoyed. Anyhow I remained professional.  The bride lives in the US and the wedding is in Jamaica, 2 hrs away from my home. They eventually put her on speaker, and I'm sure she said everything better goes as she expects it to otherwise she is going to sue all who don't deliver as she expects. HOLD UP!!!! Is she serious. She is half of a million over budget and wants to go cheap on my cake then sue me if the cake has a crack after driving with it for 2hrs.

So after I finished the orders I had  for today...I reflected and said to self you will not be making that cake...did I tell you all that it will be my birthday...o yes...stress myself to do a wedding cake on my bday and then get sued!!!!

They are expecting a revised quotation...how do I nicely tell them that I will not be able to do the cake?

Looking forward to your responses :)

Regards,

Teneisha Williams