I am seeking urgent legal advice, ENGLAND

Hi reddit, It was nice to find a reddit named “legal advice”. I am currently paying off a phone I do NOT have, ok let me get to the point. Irresponsibility of me, I lost the receipt, via post office I was provided a receipt for when I returned the phone, but as I said, I lost it. Further on, I tried to get a new one, impossible. I tried to show the company proof of payment of return, still no help. I even urged for a cctv investigation or even a IMEI investigation. It’s been a couple of months, I have contacted royal mail for an investigation and nothing was made, I am beyond frustrated because of this because when I even opened a case with ombudsman, they favoured with the company. I am beyond stressed, I don’t know what else to do, what else to seek because this is causing me financial crisis. The company admitted that there was no usage on their network regarding the phone but proceeded to say I used data, yes of course I used data. (it’s phone with sim contract combined) I went weeks without using data, in HOPES my issue will be solved and the phone will get back to them. Please help me out with legal advice that will benefit me, thank you.

LOCATION: UNITED KINGDOM

; I posted this in other legal advice reddit too.