Experian does nothing

I was the victim of identity theft in 2021 and an account was opened with MTN. I didn't know about it until a debt collection agency came knocking. I provided proof that it wasn't me. But 4 missed payment showed up on my credit report. I contacted MTN to get this cleared and they said they'd write it off. I then contacted Experian to let them know to remove it from my record, as it was also now over 2 years but still on my credit report, even though I provided emails from MTN saying it wasn't my debt. I did this in early Jan 2024 and managed to send everything Experian requested in early March. I kept following up but have gotten no replies from Experian and the 4 missed payments are still on my report. It's frustrating because I provided everything they asked for but no-one has gotten back to me for almost 4 months since I contacted them with their requested documentation. So I am not sure why they asked for it and what function they serve if they don't help a person out. I have sent emails to both *** and *** - nothing from both, after I sent my documents on 3 March 2024. Absolutely frustrating.