Abridge of Contract Teljoy

I have ordered a new Hisense 8kg Washing machine from Teljoy. All went well until i receive a call one day from Lebogang Aphane. She informed me i need to pay the full installment and the pro-rata amount. I told her according to the terms and condition on the contract the full payment is due on the 1st April and the pro rata amount is due on the 31st of March because i got the machine before the 20th of the month. So i have transferred the money to them before the time . No one came back to me after i ask them to email me that the account is up to date. So i called again and they promised me a email and statements and i didn't receive it. so on the 31/03/2019 the pro-rata and the full payment went off. this is also not what the contract states. So what do i do now ? I did pay according to the contract , so what will Teljoy do because they didn't keep to the terms and conditions . Will I need to go to the ombudsman because of this ? I am short on funds now because i paid twice and my life policy can return unpaid due to Teljoy ,