Data signal problem

Assalamualaikum sir hamary ilaqy mein jab begli jate hein to ose ky sath data signal bhi jate hein phir data signal sy whatsapp par text bhi send nahi hota pleas is par ghaor kary hamara masla hal kary hm itny mehengy packages lagwata aur phir net ka signa kam nahi kartha to hm kya kary