If you just called to ask questions and they did not show you the home and you didn't give your name and phone number - no problem. If the listing agent has your name, could be an issue, but probably not as they never showed you the property.
It is better for you to be represented by your own agent. I would let your buyer agent know the detail of your contact with the listing agent and have them see if they believe they should contact the listing agent to discuss procuring cause.
However, should the client only obtain information from the listing agent, but have another Realtor show the property, that is perfectly fine.