declined transaction

i was purchasing a cellphone and i swiped my card,as the card was processing on their side it declined, and on my side it debited,what ****ed me of when the cashier called the supervisor the supervisor just told me that unfortunately there is nothing that he can do about it, so i asked if i should just o home without my money or my phone and he was like there is nothing that he can do with a very bad attitude, after 10min of arguing i told him he should try to give me solutions not problems, he then said i should go to the bank with his cashier to make sure if the transaction was done , and yes it was done they even print a bank statement and it shouwed that there was a purchase done at pep, went there speak to the manager and she came up with the solution and then the supervisor was like thats what i told them,he started arguing with my brother end exchanging words saying he is not scared of him,what kind of supervisor who make a scene with a customer,i was very angry.