Complaining about FNB services

I have a complain about their services. First week of November I chat to their online services to close my aspire account because I don't understand this too much charges on my account. Then they said I must pay the remaining R363 so they can close my account then I paid that money. Then when I call during the week to check that my account it's close again they told me I'm owing & I ask how coz I paid that money you said I must pay so my account can be close . Even now I didn't get my response. It means again this month I wll get another charges while I reported to close my account. I explained to them that I don't want this account anymore I will use my business zero account. If they can't help me as a bank where should I get a help