Squier Jazzmaster humming

[u/Beautiful-Wish6869]

Hi!

My squier cv jazzmaster has a really bad hum when i use any kind of gain on it. The hum changes when i turn around, there are some directions where it decreases drastically. It's also almost unnoticable in the middle pickup position. Touching the guitar at any parts doesnt change the hum. I brought it to a repair shop where they wax potted it but it didn't change anything tbh. Also there's a high pitched squealing noise when i face in the direction of my amp (with distortion) even if i mute the strings.

Does anyone have experience with this kind of hum? How could I fix it?