I have an account with pay flex and on 14 May 25 I used it to buy from Makro

I have an account with pay flex and on 14 May 25 I used it to buy from Makro. I selected a 3 months payment option. They deducted the first installment but my order appears to have not been made by Makro and they can't locate my payment. Pay flex does not have a support Centre to call them. I need them to send me a proof of payment that I can forward to Makro because on the 25th May 25 pay flex will deduct the second installment whereas I do not have my order. I've sent emails since last week. Up to now I haven't received any assistance