I think it’s normal to get discouraged when you can’t get through to a prospect or they stop communicating, but the reality is many times it’s not disinterest in your service rather other priorities getting in the way of your agenda.
I had a perfect example today, when I was able to connect by phone and now the opportunity appears to be back on a positive track. My experience tells me this is more the norm than not so even I have to remind myself of this fact when the communication stalls.
Stay with it and continue dripping value, creating interest, presenting solutions and you will get your opening when you least expect it.
Keep the faith.