DH and I walked to local garden centre this morning, bought a goodly collection of seeds, 30%off.
After I had paid, the assistant handed me an ‘offers’ leaflet.
Looking through it when I arrived home, felt cross that seeds were 50% off using a voucher on the leaflet.
Sat down and sent off an e Mail, grumbling, saying that the leaflets should have been available before purchase, not after.
Only when I studied it again, realised the seeds offer began on the 27th February, not the 27th December.
Felt a right idiot, quickly fired off another e Mail, apologising. 
"Old fashioned" expressions that young people have never heard.
Threatened with legal action (follow on from potential scam thread)
I complained that they'd changed the school uniform at my child's school and how was we supposed to afford another uniform? and got a reply saying it clearly stated in the email communications that the uniform for their school year group was free
😀😀