what does it mean when someone send you a text but they dont receive your text ?

Riv93 wrote:

Neither contact are blocked on each other's phone.

If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support

if the link provided doesn't help, whomever has the issue will need to contact their phone carrier SMS is a carrier feature.

Riv93 wrote:

So I call apple or my phone company ?

Apple has nothing to do with SMS text message, so contact your phone carrier.