I'm a personal customer, how do I make a complaint? - Royal Mail …
https://personal.help.royalmail.com/app/answers/details/a_id/307
WEBIf you choose to contact us by phone please have the details of your complaint available, our number is 03457 740 740. We're open Monday to Friday 8am-6:30pm, Saturday 8am-3pm and Sunday 9am-2pm. For some complaints you may be required to complete a “Loss, Damage or Delay” form available at royalmail.com/claims .
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