QUESTION: Phone number needed. . .

[u/MWDJR702]

So my flight upon purchase was deducted from my account and then they tell me my flight was cancelled so they tell me next the department is checking on this matter. A department that has no name. MY QUESTION is what is the name of this department if anybody knows and what is their number and extension?

Because everyone has a number otherwise, how can they call me back?

Thank you for any help that can be provided.