Duplicate billing error not resolved

I did some blood work on the 2nd of June 2025. On the 11 August I received an sms saying that I owe them money. I checked the claim and discovered they charged me twice for one of the tests and of course my medical aid rejected the one duplicate. I emailed them on the 11 August and to date still no response. Their contact numbers do not work. Today again I received an sms to pay. UPL team please rectify your error and get back to me.