If you truly believe that your product can meet this prospect's needs, then you need to keep trying to get in touch with him. However, you may want to try a couple of different strategies.
Try calling early in the morning or late in the day, and if you get him on the phone, ask is if this is a good time to talk. If it is, start your presentation; if it is not, ask him when you should call back. If he gives you a designated time, be sure to call back right on the dot.
Since your real objective is to get a meeting with him, a slightly more assertive second approach may help. This time tell him something like, "I know how busy you are, but I am certain that our product can save you X dollars or increase your revenues by X. I'd like to set a 15-minute appointment with you. If you're not convinced that this is the product for you within that time, I'll leave. How would next Tuesday at 9:00 a.m. work for you?"
Either way, remember that generating new customers is a time-consuming process. It is always said that persistence pays, but so does patience.
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