Dyn is the worst DNS service provider we have ever come across in our experience.
They have been displaying hiked QPS for their own benifits to cheat their enterprise level customers. Please beware of them and stop using their services or else you will realise that your credit is automatically being charges 10 times of the charges committed by them.
They have been auto renewing the contracts without taking consent from the customers and want customers to pay monthly payments for the entire year.
Their customer service is even pathetic for enterprise level customers.
Better to go with AWS route 53.