When accepted Yes, that is when you go into contract, as the seller has accepted your offer,
Or countered your offer
When rejected no, the seller may just not have the band width to do it.
Imagine where you wrote a low ball offer and upset the seller, or the seller recd. 15 offers
And takes one, and asks his agent to let the others go.
You can always send a Request for Acknowledgement, if that does not appease you
Then, definitely consider knocking on the sellers door, but be sure that you had written
A good offer and not offended them.
Move on, good luck.