As humans, we do have a tendency of giving up too soon or just forgetting because there is a lot of other work.
Always remember -
One bad experience can ruin many more customers linked to her/him.
We love to chase the big transactions, but they are difficult and time-consuming. Many a time, the client will not even close. You will end up wasting time and end up with ZERO REVENUE. The small fishes help a seller sail in such time.
- Not all clients are always ignoring you
Some can be genuinely busy for longer hours - business, family, kids, or anything. So, do not judge.
When you decide a time to call back, the client remembers the same subconsciously and more often than not, will take your call.