TFG unable to allocate payment - slow payment allocations

My wife recently opened a Jet Stores (TFG) account, and made a purchase. A statement was received advising that the total balance was R758.00 with an instalment of R75,00 due on 1 March 2023. On the 28 February 2023 she made an EFT payment of R760,00 which should have covered the full initial purchase. On 2 March she received reminder SMS stating that an amount of R75.00 was overdue. We visited a TFG store on 4 March 2023 only to be told that the payment would only reflect after 7 days, and that the final due date was 7 March 2023. On the 7 March 2023 she received another call still stating that the instalment was overdue. She then submitted proof of payment for the R760.00 made, and she is yet to receive confirmation that the payment has been allocated to her account. Why so long??? There are 3 fundamental flaws with your systems and processes. Firstly if payments take from 72 hours to 7 days reflect why follow up with customers who make payment just before or on the due date? Secondly why in this day and age does it take so long for a payment to reflect? This clearly means your system is outdated. Payments between individual parties with different banks don't take more than 48 hours to reflect. Why is TFG so primitive for such a huge organization? So pathetic. My wife is up in arms, and is so annoyed with such grossly unprofessional service!!!