Request to return non-existent equipment

Hello,

I switched Xfinity account to Internet Now, and it was smooth. How, now I am bombarded by text messages asking to return equipment. I was using my own but checked my account, and it doesn't show anything. I answered that to the text message but obviously it is unattended, and the same message keeps coming. I checked with a Xfinity store, and they confirmed that I do not owe any return. Could you please advise how to resolve the issue.