Stupid, incompetent, arrogant, waste of space Royal Mail

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There is no way to stop them delivering unaddressed litter to my home. I've tried registering (umpteen times) for the scheme they claim lets you opt out - what they say is a pack of lies, and registering is a waste of time.
I've tried raising a complaint on more than one ocassion, but nothing gets done - they could not care less.
From now on a post box is a litterbox as far as I'm concerned, I shall treat them the way they treat me.