This technique is called 'the silent close'.
'. . . so I silently closed and he called me back'.
Whether selling or buying, there comes a point in the negotiation when nothing remains but to close the sale. Any further conversation will tend to open up topics that have already been covered and will result only in the other party having second thoughts.
The 'silent close' is when one party withdraws from further discussion and merely waits for the other party to accept the transaction.
It is as true of marketing (buying or selling) as it is of legal, court discussions that one can talk one's way into - and back out of - a successful argument.
'The Silent Close'
'Why Silence is Crucial to Sales Success'