Where did my data disappeared to

Well having for years contract 10 gig daughter 10 gig night. When receiveiving message you don't have data I send message on contact us now response

Don't watch movies LIke Netflix etc. Will watch once in two weeks ago when hearing song on radio look it up like I always do usually get by almost the end of

Month 2 gig warning but what happened august I have no idea how this happened seems the same problem as with vodacom