Unacceptable, shocking service

On 24March 2024, I inadvertently paid the import duty of R 77.53 twice on Tracking no.BUFZA***YQ on 28 March 2024. I have been trying to get a refund from 02 April 2024 but to no avail at all. First request was on 02 April, followed up on 08 April, 17 April and 29 April. I eventually got through to them on the phone and they said they could not find my request so I completed the Bank details refund form again and emailed it to them, together with both proof of payments. This was on 02 May, 2024. I followed up on 8 May and again on 10 May, but no response received at all. Their Whatsapp number is useless, I'm still waiting for a Consultant to contact me. Please can this long outstanding request be looked into and advise when the refund will be effected!!!