trade in device ISSUE!

so I have a trade-in device to get a credit for 650$ I sent it on their provided prepaid label, and delivered on Feb 20 2023, because they received it before March 4 2023, but then until now no update regarding my trade in device status still on not receive, and I keep contacting them like every 2 weeks on live chat or phone call. so what now xfinity? I'm still waiting? and keep telling me to follow up on the warehouse for 10 to 20 days. or just send it back my old device and I will return the new one and I will just switch to another carrier for this failure trade in device and proceed to legal