Pathetic service

I booked a ticket on mango airlines and had to pay at checkers. Paying in stamps and by card the cashier confirm's R2000 in stamps and baLance to be paid by card.after confirming twice with her to double check she agreed it's R2000. However the next day the manager calls and tell's me I'm in possession of a ticket which isnt fully paid and if it's possible for me to come and if no arrangements made it will result in my ticket being cancelled. Going into the store the cashier apologies however the manager had an attitude which she believes she does not. My concern is however she made the mistake not me. I then wanted to cancel my ticket then they could not do that. The way I was treated was beyond sickening. She made me feel guilty for cashier mistake. However upon wanting to cancel the ticket they wanted me to be liable for cancellation fee but I'd there staff didn't mess up this wouldn't of happened. She calls me to the office and explain's as if I'm a small child. End result I paid the 1000. Also informing me there are servalince camera in the money market yet I can't see it without authority. I'm still waiting for them to contact me. They then gave me a bunch of flowers. However this is pathetic and very unprofessional...