I got so peeved off with my local Post Office agency refusing to accept 'old' pre-paid registered post stickers that I shoved 30 of them in an envelope and sent them off to Australia Post complaints in one of the envelopes they provide when you want to claim on missing registered mail.

It only took two months but I got 30 brand new labels back this week and a letter of apology, plus a note that they had 'counseled' the PO agency staff.

Pity I use click and send, now, and a pity all the prices are going up again 😄