I am also getting these notifications for untracked items that have been sent.

I am also getting bombarded with notifications with offers, of other sellers selling the same item I am selling.

I have even got a cheaper offer for a item that I had already purchased, I did not cancel the transaction and buy the cheaper one, but am aware that Ebay now allow this.

The only way to stop this is to pay for a subscription, then you can opt out of this spam.

Ebay are going to lose business if they don't stop this.