I have learned the hard way also, try looking for info on mortgage rates. What I have found out that works good and keeps your cell quite is get a Google phone number and use it. You will get an email for each call with the message in a text if a message is left or just listen to the message.
I made that mistake too and now I have about 10 companies calling me. I no longer answer their calls!! We had Aetna but now we have BCBS because of Ocare. Husbands employer changed us and we have less cverage now. Lost our dental and eye covrerage.