No, a phone call is not a supplemental response to interrogatories. You only have 45 days (plus 5 days if the responses were served by mail) to file and serve your motion to compel further responses.
If the phone call was to confirm an extension of the 45 day deadline, then you should have confirmed the extension in writing. Otherwise, you might be time barred from bringing a motion to compel further responses to this set of interrogatories. Moreover, you need to meet and confer before you can file such motion.
If you never received any responses to interrogatories, you should file a motion to compel responses under CCP section 2030.290. There is no 45 day deadline for a motion to compel responses.
For additional assistance, see my guide:
Mr. Chen's response is complete and accurate. A "further response" would have to be an amended or supplemental response, and it would have to be in writing and verified by the party.
DISCLAIMER: Nothing herein is intended to be construed as legal advice, and nothing herein is to be construed as having created an attorney-client relationship.