If you have received from third parties (such as “TM-Collection”, “Trademark Registry”, “Trade Mark Register” or similar) with purported Bill(s) or Invoices, either for purported registration and/or listing of your trade mark(s), you are strongly advised NOT to effect payment thereof. This is most likely to be a SCAM or a FRAUDULENT CLAIM. If you are in doubt, always forward a copy of the document to your Trade Mark Agent

This warning is also given by WIPO at this LINK.