They robbing people off.

I have an account with homechoice, March 2020 I decided to settle my account before they debited, which the last installment was going to be in Aug this year. 18 April 2020 I ordered again resulting my new installment being R250 but I get a statement saying I must pay R408, i called HC for clarity and i was told because i didn't call them back after i settled my account i still have an outstanding amount from my previous order which was settled in March 2020. I was told to pay 408 for 3 months meaning R158 extra for the order I settled in March which the installment was to end in Aug. Am very disappointed in them cause and believe that my account was supposed to start at R0 from the 7th April 2020 .