Van schaik bad CUSTOMER accounts service

I am so aggrieved about the way my account was handled. I was given 5000 to spend and only spent 2500 then my first statement came and I found out it was a 30 days account. I then communicated with a lady by the name of Natasha Prins and asked the balance to be divided into six equal installments. She then made me sign the six months instalment agreement, only not to load it on their system after I signed it. I went into the store in Maponya mall to try and purchase pens with my remaining credit only to get there and find that my account has been blocked and couldn't purchase. I showed the store manager my communication with Natasha and she advised me not to pay the account until she speaks to Natasha about the matter but clearly didn't . This account is showing in arrears and I cannot make any purchases on it. I am so unhappy with the handling of my account that I'm going to close it once I finish paying it!!!! ,and that's a promise!!!