i have lost my phone so cannot provide a serial number and findmy iphone not locating my device

Contacting Apple regarding your lost phone is pointless. If you can't locate it with Find My iPhone, then it can't be tracked.

Notify your carrier and law enforcement.

What To Do If Your iDevice or Computer Is Lost or Stolen

Apple, and no one participating in this forum can't help you locate the phone, serial number or not. If Find My iPhone can't see it, it's powered off.

What to do if your iOS device is lost or stolen

Reporting a lost or stolen Apple product