PwC added that at present Jessops would not honour customer vouchers or accept returned goods.

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Medallion owners said the city was illegally changing what was supposed to be an ironclad rule: Only drivers using a medallion could legally stop to accept a customer who hailed them on the street.

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It will then send back a message alerting the cashier to either accept the card or ask the customer to use another one or pay in cash.

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