Website Payments not returning contact phone number even after setting it as mandatory

[cathayarmory]

Hi people, hope someone can help.

Due to requirement of our post office the phone number is mandatory to ship packages. Therefore under the "website payment preferences"

I set the "contact phone number" as “on (required field)"---however I am still not receiving any phone numbers. This is causing a lot of trouble for my business.  

What may have went wrong?