A recent mass email purporting to be an invoice from TT Post is a well-crafted phishing attempt.
Anyone trying to pay the imaginary fee online will be giving up personal information to bad actors. There are an increasing number of malware emails designed to capture personal information that make use of designs that clone official correspondence and lead to websites that also mirror official internet presence.
Emails notifying you of unknown charges or unfamiliar emergency situations should be investigated using known channels. Do not click on links or buttons provided in unfamiliar or unverified emails.