I am trying to store french string in mysql DB but it not get proper stored and changed some characters and not get display proper in my webpage

Original string: Bonjour Mr/Mme « Nom de famille du prospect », je suis « votre prénom » d’Europ Assistance La Téléassistance…

Stored string : Bonjour Mr/Mme « Nom de famille du prospect », je suis « votre prénom » d’Europ Assistance La Téléassistance…

I have tried with many solutions

• header('Content-Type: text/html; charset=UTF-8');,
• Collation is utf8_unicode_ci,
• Used SET NAMES UTF8,
• tried mysqli_set_charset($conn,"utf8") when select from DB,
• Also tried with ISO-8859-1

Also tried many HTML functions but did not work character_set_name is utf-8

character_set_name is utf-8