I'm not really happy...

I'm not really happy with the experience with the bank last nite I went on the app to buy a voucher of R50 and I had a R77 in my account but they took my money out of my account but I didn't get the voucher I went on hey Whatsapp group to report the matter but still didn't get help the was told to look at the history on the the ott history to see if it's not there but there was nothing but my money was took out of my account this morning I checked again still nothing wanted to speak to a agent was advised someone will chat with me on Whatsapp but still nothing I send a email still no reply I really hope u guys can help me get answers from Capitec bank