shocking customer service

l once bought a JVC 50" smart tv at hifi that tv was crashing the software each and every 2manths and i took it back to the store and they gave me a credit instore to buy something else so yesterday i went to top up the credit that i have to buy the new tv but they didn't have the stock on the tv that i wanted so i choose another tv and still they didn't have the stock how can they have they have the product on the display while they don't keep the stock anyway i ended up choosing to take the display when i get to the till they told me that they cant make the sale because they have already made the cash up which shop that's doing the cash while they see the customers in the store and the shocking thing is that i was in the store for like 20 menets before closing time waiting for them to check for the tv that i wanted to buy and the ladies that's working on the till in front of the store they dont know how to talk with customers they have a bad attitude they were taking to me like we cant do nothing and you cant do nothing as well and i told them that i wont get another chance to come to that store ever again because im always at work and they told me that they have nothing to do that the service is shocking i ended up asking for the refund because they didn't assist me as a customer i don't want anyone to have the same experience that i had with hifi cooperation's in Boksburg at the retail pack

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Kind regards Christopher Maphosa