Home choice

I bought luggage from homechoice and finished paying last month a week later they sent me a sms which said I have R45.09 oustanding balance I paid it 3days later I received another sms that I have R7.09 oustanding i email them to for clarity as I have finished paying but I never received an answer later they sent another one to say I now owe R11.05 I'm deeply hurt and disappointed at how the treat customers. I believe if I finished paying they were supposed to take their money and close the account but no they still want more money from me, which is a broad day light *******