Need CRM which can connect to Retreaver.com

We need a CRM where we can import the data from Retreaver.com including all call logs, Endpoints (Contractors) and the Contractors can manage their account as well from the CRM.
We have already tried Hubspot, Salesforce, Zoho, etc, and these don’t have features that we need.

So Basically, we need a CRM which is already present somewhere which we can use or a CRM which we can use as a base to expand It as per our requirements.

Your Suggestions will be Really Helpful