https://wei.experiencedynamics.com/
Steps:
1. Go to https://wei.experiencedynamics.com/
2. Go to contact us at the right top corner
3. Fill up the telephone with any alphabets or special characters
4. Submit and then observe

Expected: Telephone should be numbers only
Actual: Telephone accepting alphabets and special characters

Screenshot: https://prnt.sc/15p6jye