Hello, Jack. My name is Evgeny.
I am currently busy with automation of a realestate agency. They have 15 phone numbers to which customers call them, calls get routed to realtors. there is a requirement to keep the history and also realtors can do SMS-chat with customers from within the application.
And personally I have a food delivery business with CallCenter, so I know how the call center operates.
As you say the price will really depend on what exactly the final requirements are going to be.
Hope you will like my profile (this is all just for 2 weeks being on site) and we can talk further about this over skype perhaps.
regards, Evgeny