Screenprotector scratched with an ugly mark.

I've upgrade my contract at Mtn Bothaville and my very dissapointed. I've ask for a screenprotector for the new phone and my old phone, the salesperson suggest the new gel protector. I'VE PAID 598.00 with my bank card. The salesperson Adriana Willis mention of I see a mark it is like windbubbles but it will be away the next day. There's a big mark on my brand new p30 lite. A scratch or a dirt mark I can't see what. I've called her the next morning because I start using my phone, she said it's not her fault I've told her it wasn't me either. I'M ****ED OF EVERY TIME I LOOK AT MY PHONE. Now I have to drive 120km again so this can be fixed, who's gonna pay for my diesel. And secondly, she underestimate my intelegence. I'm not ****** stupid. I want this screen fixed or I will cancel this contract. I have photos of my phone as well as the time I've called her Saturday morning.