The plugin we are using does not include a price range that’s why you got an error in that field. About the phone number, the only accepted format in Schema is +1-888-888-8888. If you use other formats, Google will show errors and there is no way to fix that. However, you can safely ignore it. There’s no field in Schema that’s mandatory. Also, errors will not affect your site as these are ignored by search engines whenever structured data tool finds them.