Threat I'll be charged for equipment I already returned

Hello,

I disconnected from Virgin on the 25th July and received an email a few days later to say I would need to return my equipment (Virgin Hub 3 and Stream TV Box) and to wait on the pre paid returns packaging with label to be sent to me. I received the returns packaging with the label on 05/08/2024. I tried to return this to my local O2 store who said they can't take it as it has a Yodel label fixed to the package already. I was a little disappointed but then checked to see if there were any Yodel drop off points near me.

On 09/08/2024 I visited a local OohPod drop off locker location and left my package in one of the lockers they provided. I then receive a receipt via email to confirm I had dropped the item off with the tracking number. 

The tracking number is 8T6P53214415A961. The tracking information shows the returns package was received by Virgin on 12/08/24 at 21:37. I have now received an email threatening I will be charged £85 on 24/08/2024 if the equipment isn't received. 

I contacted Virgin via WhatsApp who said even though the tracking information shows it was received that Virgin haven't received the package and to contact them again in 3 days. I don't feel I should need to keep contacting Virgin about this, as I did what I was asked and returned the equipment. 

Would anyone from the forum team be able to contact me about this?, as the WhatsApp team don't seem to be able to help and just say to contact them in 3 days and I cannot get through on the phone.

I've attached screenshots of the email I received and the tracking information.