wifi not working

Hi i am Reykita from India , recently i purchased a new dell laptop inspiron 15 3000 around in may 13 2019 since then the laptop is very slow . secondly i 'm receiving updates every now and then , but wen i connect to wifi  my laptop does not update only i use jiofi ( wifi worth Rs.399/- ) so can ull suggest me if this package is not applicable to update the laptop or there any other issue . earlier when i had the same issue , i showed it to the dell centre , but now i 'm facing the same thing plz help.