Truworths is desperate for money

I bought a Jacket the 12th of May 2018 at Truworths. Today is the 30th of May 2018 and I already received 3 sms's that I must remember to pay my installment of R118. The sms's also said before 5th of June. So please give me until the 5th of June, most people only pay the 25th of every month. 3 days ago I received several calls from Truworths, but I did not answer. Actually I was wondering who that number is that is calling me constantly. Today the number called again and I picked up and the guy said he wants to speak to KI Carstens, and I said yes that is me what is this about? Its Truworts and first he needs my ID. I said sorry no I will not give you my ID what is the problem? Its the Truworths account. I said what is wrong with the account? I must please remember to pay my installment before the 5th of June. Really? How can I forget I received 3 sms's before payday already and today is the 30th but I paid today just before the call came in. So it is paid. What is this about? I was not even late with my payment, I never am. So he said again but now he needs my ID and again I said sorry no I will not give you my ID what is the problem? Now he wants to know if he can put me on a debit order and I said NO I do not want to have a debit order and my account is paid although I still had time till the 5th of June. He wants to know why I do not want a debit order and I said because I like to go in the shop, look around and browse and than pay my account. Ok, he said but please remember your installment of R118. REALLY????? I mean really?