Our extensive call center industry experience has shown that a percentage of small companies that launch their own phone campaign place very little consideration into the telemarketing script itself The attempt is respectable but after long days on the phone and not accomplishing the desired results most come to know that telling is not selling on a phone call A checklist of products and services with a polite introduction may work occasionally but the majority of people are numb from telemarketers before they can get through a presentation

What is the correctly punctuated version of this sentence?
Our extensive call center industry experience has shown that a percentage of small companies that launch their own phone campaign place very little consideration into the telemarketing script itself. The attempt is respectable, but after long days on the phone and not accomplishing the desired results, most come to know that telling is not selling on a phone call. A checklist of products and services with a polite introduction may work occasionally, but the majority of people are numb from telemarketers before they can get through a presentation.