Bcbs ins cards can be confusing to a providers office staff. Sometimes the card will say there is a deductible and/or a copay. So they are unsure what to collect.
Generally speaking if the provider was in network, meaning they participate and have a contract with bcbs, they should only collect the copay. It is probably $15.00 for a family practice or internist and $30 for a specialist.
If they collected the $197 and $300 up front and called this your deductible and they are in network, then you should be due a refund by the provider. Bcbs is not the one who collected it from you and will not be the one refunding it to you.
If they are not in network, then you may not have a credit. However, if they filed a claim they should have checked a box on the claim form that tells bcbs to mail reimbursemnt to you (if any).
The correspondence bcbs sends you will show the contracted rate and adjustment and your responsibility to the provider. If you paid more than what bcbs says you are responsible for, they need to issue a refund to you or they are in breach of contract.
This is what I do for a living. I go to bat for the patient.