Asking for the same payment twice?

TNT has been consistently imcompetent with issue of customs clearance invoices and release of cleared items. They constantly require the customer to follow up and tell them to do their jobs or items just stand at the depot. In 2017 I have called them at least 70 times for each of the 20 or so items delivered through them. I have accepted that they are sub standard but this year it appears that they invented a new trick. They claim that they did not receive customs payments and ask for the same payment twice. What a ripoff! This is dishonest and counts as *****! Be cautious. They only use the brand name of an international company but are dishonest and *********** like a third world country service!