If the change of status was approved with immediate effect, you are to maintain H-1B. Consult with an immigration attorney if you did not join your H-1B employer.
This response is general in nature and cannot be construed as legal advice, given that not enough facts are known. Any comments offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship. If you would like additional information based on this response, please contact my office at 510 657 7665 or 415 902 0832 to schedule a consultation.