Money ****!!!

In March I called Accounts department and asked for balance on my account and arranged for debit order to take the outstanding balance, that was done successfully. On Friday I received an sms with balance, Saturday and today 26/07 I received a call and was told I owe them when am I going to pay, I asked how is tht possible because I settled my account in March, and advise them to go back and check what was my outstanding balance in March before I settled my account, the lady said i was suppose to ask for settlement letter but i was not told that when i paid my account in full in March, I'm very disappointed with their service, HOMECHOICE IS A DAYLIGHT ********. VERY POOR CUSTOMER SERVICE ALL THEY CARE FOR IS GETTING MONEY THATS IT!!!! (MISS P MPHITHI ***)