Hey @Mul, did you purchase the phone after the 5th of August? Can you try placing your claim from this link? If you still can't claim the offer, you can reach out to the relevant Promotions team by filling in this form or calling the number 0333 016 4054.
Hey @parker19691969, if you are struggling to upload your proof of purchase, try changing internet browser or connection or upload a different file format for your proof of purchase. You can also try uploading it from a laptop or a PC. If you are still struggling, then the Promotions team would be the best point of contact.