Unfortunately that is what it sounds like... might be time for a word with the seller?

Definitely don’t plug this in to any more receivers.

Double check there are no wires or strands of wires bridging across any of the terminals at the esc or motor. Extra check that the polarity of the wires matches the polarity of your battery (especially if there is a connector on there!). Maybe if you find something obviously wrong and fix it then you could try a working receiver, but i would suggest moving on to a new (unused) esc and receivers.