I called the morning after I emailed the proposal and it went straight to voicemail, emailed after a couple days, and
then called and caught him "at a bad time" and he said he'd call back in a little bit, he never did.
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I would say this was the point at which he was indirectly telling you
NO
I agree that you have tried to contact the potential customer enough.
The ball is in his court now he will have to decide. I wouldn't waste any more of my time with this guy. I had a simular situation last week. Went out to estimate building a 200 amp service and wiring in a modular home.
I looked the situation over took notes on needed materials & difficulty of the job. Told the customer I would call him back with a price when i got the job figured. He said fine. I called him back late that evening . Gave him the price.
He said he had to talk to his wife. So I figured that was the end of it.
I marked him off my schedule at this point.I knew my Bid was competitive.
Late the next day He called and to my surprise awarded me the job.
You never know what people will do, Of course I figure he was Bargin hunting. Anymore I just give them my price, They accept or reject.
How ever it goes I just go with the flow. Don't haggle .