Terrible poor service.they are ****ming me

I bought an IPhone 8 from appleguy,their service is beyond terrible,im sitting with the phone for 2 weeks and its not working since its asking for a passcode or appleID that they didn't give me. I tried calling them and sent messages but they don't help me..they asked me to send pics on whatsaap which i did. Its been 2 weeks and today im trying to call them again since are ignoring me and they are hanging up my calls. Im frustrated im tired of following them.