Phone still has problems after warranty claim

[Ab00dGH]

First of course after the update the buttery but even before the wireless and Bluetooth are not working properly like the wireless doesn't work unless if I am standing with 3 m of the wifi and I tried it with more than 20 different wifi sets and yet the same problem, also the same thing happening with the Bluetooth connection, and also there is a black dot in the front camera.
And I went to the guaranty provider more than 3 times and everytime I send the phone they send it back with problems.
What should I do in this case???

[CameronT]

Hi @Ab00dGH,

I am sorry to hear about the issues you have been facing. Unfortunately there isn't much else I can advise here other than keep in touch with your local support team as this will be a local matter. Good luck.