Sub-standard service from Europcar

I am a loyal Europcar customer. On 8 April 2026, I rented a vehicle at Bloemfontein Airport and returned it on 9 April 2026. To date, now more than three days later, I have still not received an Invoice from Europcar which will trigger the refund of almost four times the "pre-deducted" rental amount to me. Europcar was quick to deduct almost five times the quoted rental amount from my credit card, but is slow to issue the required Invoice that will trigger the substantial refund to me. Cone on Europcar, this is not good enough!!