Short: Had a package held due to a charge but no one at Royal mail could tell me what the charge was for. Forced to pay a fine with no reason given. Long: Been using Royal Mail since 2004, 100's of packages sent, Sent a package on 20/04/2024 weighing no more than 500 grams (a single Nintendo 64 Cartridge & bubble wrap in a regular thickness box ) and all measured to size, never mis-weighed or measured a package wrong in 20+ years. I always check the tracking on my packages just to make sure they arrive okay and found a message on 24/04/24 saying my package has been held due to not having the correct ammount of postage paid, no alert or notification, just happened to check up on it, instantly phone them up and ask what the issue is just to be told by the representative that they would not be able to tell me over the phone and that i would have to wait for a slip to be posted to the recipients address with the reasoning. On 25/04/24 the slip arrives at the recipients address with nothing but "sender did not pay the full postage" and that i owe them £3.20 so i phone back up to inquire what this charge is for as i've definitely paid the full amount only to be told that they could not give me that information as they do not have it and that Royal mail would never make a mistake and that i would have to inquire to the office holding the package myself as to why its being held, the representative eventually forwarded the enquirery for me to the office holding my package and told me that they would reply within 10 days and that the only way to get my package resent to the recipient was to pay the charge. I agreed to pay the charge on the basis that they would provide a reason behind the charge so i could at least know what ive been charged for and then have the chance to challenge it if i felt i wasnt in the wrong, i received one email on 08/05/2024 stating that "We're just letting you know we're continuing to investigate your query: 1-11332255113 and we'll get back in touch with you as soon as we have an answer for you." Its now 30/05/2024 and ive still heard nothing. This is the worst customer service ive ever experienced in my entire life, to have your goods seized over a charge and not even be told what it is you're being charged for and expected to just pay it and trust them that its for a justified reason is nothing short of complete madness. I will absolutely never use any of Royal mail's services ever again and will advise everyone i possibly can who is sending anything to avoid them like the plague. you cant just treat customers like this, we're actuall people at the end of your little reference numbers.