Adding domain MX record and DNS in AWS Route53

First, set the NS record. Then, delete all other records from the vendor controll panel including the default MX (Domain provider CrazyDomains) records.

Secondly, add a MX record in AWS Route 53 with your Service providers default server neme, that is (MX, 10 mateswork.com), it will help you to receive emails in your Hosting service provider mailbox.
After these settings, make sure, if you can receive mails in your vendor's inbox.

To check the MX record of a domain (in windows):
nslookup -type=MX domain.com nsservername.com