I've had a nightmare with trade in, it's handled by MTR so Samsung just wash their hands of the issue and say go speak to them.
That would be fine besides the fact there is no phone number (or at least one that gets answered), the furthest I got was reaching some random persons mailbox in HR but was full so couldn't leave a message anyway!
I sent my phone on Friday 8th October, they confirmed receipt on Monday 11th, I then got notified on Wednesday my phone was going to be locked, reached out and they did pick up the email and asked for my Samsung order number, provided this but no further updates.
Phone got locked Thursday 14th (despite them having the phone), sent multiple messages to MTR and Samsung, and live chat with Samsung, Samsung just kept telling me to contact MTR but couldn't quite understand the issue and they had my bloody phone.
My phone was unlocked this morning thankfully so have backed up some stuff and moved my Google Authenticator to my tablet.
Customer service was as absolute joke.
Thankfully my Flip 3 was within the 28 day return period so have told Samsung they can shove it and I want a refund. Being collected on Monday.
I now have the wonderful task of trying to get my Note 9 back from the clowns at MTR.