Card error

Today i tried purchasing with my account card and wanted and authorizasion code which us not the first time it did this they called customer car but the line was very bad they were not hearing each other i kept waiting for them yo ring up my items. I waiting for 1hour 30minutes still no progress i ended up leaving coz i c its a waste of time cashier said they dont knw what to do im so angry even now i wanna close my account coz wats the use of buying wherelse u know ull wait the whole day to ring up few items gunny part is that i had credit on my account.cashier was even annoyed didnt even showed sumpathy on whats hapening instead he couldnt wait for me to go. Train the staff to be respectful act proffesional regardless who they serve!