Eu's GDPR defines several rights and obligations, one of which is :
Personal data shall be [...] accurate and, where necessary, kept up to date; every reasonable step must be taken to ensure that personal data that are inaccurate, having regard to the purposes for which they are processed, are erased or rectified without delay (‘accuracy’);
OP could contact Facebook's Data Protection Officer, that they are required to have, and demand that his data is fixed. A complaint can also be filed to the relevant country's Data Protection Authority if needed (I've done it with some success).
Personal data shall be [...] accurate and, where necessary, kept up to date; every reasonable step must be taken to ensure that personal data that are inaccurate, having regard to the purposes for which they are processed, are erased or rectified without delay (‘accuracy’);
OP could contact Facebook's Data Protection Officer, that they are required to have, and demand that his data is fixed. A complaint can also be filed to the relevant country's Data Protection Authority if needed (I've done it with some success).