Frustrated with poor inaccurate service

I had an account with Bradlows few years ago and paid it up , even before I closed the account they owed me about R400 and something , which a lady called me after I posted on hello peter saying she apologises and will look into the matter and get back to me and arrange a refund ,which never happend, I then settled the account anyway and closed it so I could have peace of mind , just need get time and look for the paid up letter they send me , now I cant have peace of mind while they email me everyday and the more I respond to them telling them to check their records I don't owe them , they keep emailing me saying I'm owing , nobody even bothers to call me to solve the matter , they just send emails as a tick box exercise , they don't check any records , this is super frustrating and disturbing . I so regret doing business with you .