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Did you try contacting the

Did you try contacting the source of your seeds to ask what type/variety they are? Pole beans can grow to 5 to 8 feet; they are essentially "born to run."

You could try topping them off, a little at a time/everyday or two, rather that a long-length pruning. Beans are usually self-pollinating, so give them awhile and see what happens.

BTW, it's early in season, so you should also consider growing some bush beans. These would mature at a manageable height.