iPhone 7 won't connect to wifi

Hi well I’ve had my iPhone 7 for awhile now from boost that I bought it on the website and just today I discovered a problem that when I go to my personal wifi (my home wifi) and type in the password it says it’s wrong but I 100% know that I’m typing it right is there a way I can fix this or trade my phone in for another iPhone 7?

Google Alert – “iphone 7”