Poor Service and NO RESONSE - Missing Payments

Last week 23 July I paid second installment which as due as well as the third installment in advance. It showed the one installment was unsuccessful so I paid it again. Later that day I saw it went through on my bank statement three times and not two, but it only shows two on my Payflex. I contacted my bank and it has indeed gone through three times. I cannot get hold of Payflex via any channel, the phone line does not work and they are not responding to my emails. A total of R1953 is now missing with a fourth installment due 27 August, which I have technically already paid.