I work at a telstra store and it's pretty obvious the store is telstra so we don't ask customers whether they're with telstra when they come in wanting prepaid credit.
Customer: Hi could i buy $20 credit for my mobile and can you put it on there for me (she was elderly)
Me: no problem --> i put it through, she pays with a credit card, i take the voucher and her phone to put the credit on and see that the service says Vodafone.
Me: err you're phone is with vodafone
Customer: yes?
Me: you're in a telstra shop
Customer: so you don't sell vodafone credit?
Me: um... no...
Customer: oh.. well what do i do then?
Me: well we can refund it and you can buy credit at coles down the hall or the newsagents. Sorry about that i thought you were with telstra
Customer: WELL you won't make that mistake again will you!!
...
Customer: Hi could i buy $20 credit for my mobile and can you put it on there for me (she was elderly)
Me: no problem --> i put it through, she pays with a credit card, i take the voucher and her phone to put the credit on and see that the service says Vodafone.
Me: err you're phone is with vodafone
Customer: yes?
Me: you're in a telstra shop
Customer: so you don't sell vodafone credit?
Me: um... no...
Customer: oh.. well what do i do then?
Me: well we can refund it and you can buy credit at coles down the hall or the newsagents. Sorry about that i thought you were with telstra
Customer: WELL you won't make that mistake again will you!!
...