Looking on the internet deeply has found these results:

They said they will come but they didn’t. is the most popular phrase on the web.

They said they would come but they didn’t. 11 results on the web	They said they will come but they didn’t. 15 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
They said they would come by the path, so... My family was supposed to be here at 11:00, and they said they would come, but I don't know why they're not here yet. They left Parliament in disbelief, disgusted at not having been heard, and some said that they would come back, but only to cause damage. At the time you said they would come looking for my daughter. But they said they had no choice. But they said they don't deliver here. They said they would come up with ideas for specific international support. But they would come home and we would save them.	But they will come after me if I try to help anyone. Maybe different, but they will come back. I don't know, but they will come. They will come anyhow, but they will live in slums, favelas and informal settlements. You will leave them here and hide yourself in the bunker But they will come to you anyway, they will come to you dead, and they will sit before you just like now. Maybe different, but they will come back. But they said they don't deliver here. Not in my lifetime, maybe not even in yours but they will come.

They said they would come but they didn’t.

11 results on the web

They said they will come but they didn’t.

15 results on the web

More popular!

They said they would come by the path, so...
My family was supposed to be here at 11:00, and they said they would come, but I don't know why they're not here yet.
They left Parliament in disbelief, disgusted at not having been heard, and some said that they would come back, but only to cause damage.
At the time you said they would come looking for my daughter.
But they said they had no choice.
But they said they don't deliver here.
They said they would come up with ideas for specific international support.
But they would come home and we would save them.

But they will come after me if I try to help anyone.
Maybe different, but they will come back.
I don't know, but they will come.
They will come anyhow, but they will live in slums, favelas and informal settlements.
You will leave them here and hide yourself in the bunker But they will come to you anyway, they will come to you dead, and they will sit before you just like now.
Maybe different, but they will come back.
But they said they don't deliver here.
Not in my lifetime, maybe not even in yours but they will come.