As far as I know, there is not a formalized service to achieve this. Try tapping into your network and your local startup community to find the following persons to give you feedback. Most people would be willing to take 15-20 min to provide your with feedback.
1. VC Investors - Professional investors see hundreds of pitch decks and know what to look for. They can also give you the investors perspective. This is the most important person to get feedback from.
2. Entrepreneurs who have raised capital - If they have gone through this process, they have likely gone through multiple iterations of their deck. They have the experience of the feedback they received, and what worked for them.
3. Someone who doesn't know your business or your industry at all. The saying "if you can't explain it simply, you don't understand it well enough" is very true. True pitching someone who have no clue about your space. E.g. Grandparents, kids etc.
I hope this helps.