Are you sure the wiring diagram is correct? The first thing to do is count the number of pins. If it really is 12, then check to see if the the dp and/or colon really works.
There are two things here that are beyond comprehension:
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A situation where a user actually requires the dp and colon alight at the same time.
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The company that made this is still in business.
In the light of 2, there probably isn't much point in trying to ask the company that made it, as they probably aren't.. If dp and colon really are on one pin, you might return it for refund - "not fit for purpose".