Hello Ed,
Is the field you want to hide/show within the repeating table, or outside of it?
If the field is outside of the repeating table, here's how you would set up the formatting to do what you describe:
To set up the condition:
In the left dropdown of the Condition dialog, select Select a field or group..., choose the field you want to use for the filter, and before clicking OK, use the Select dropdown to choose "All occurrences of [field]"
In the middle dropdown of the Condition dialog, select do not contain
In the right dropdown, enter the text Telemarketing
So the full condition, should read as "All occurrences of [field] do not contain Telemarketing"
Then for the actual formatting, check the box for Hide this control.
This should make it so that the field is hidden iff none of the values contanins "Telemarketing", or in other words, it will be shown if any of the values contains "Telemarketing"