Disgusting Service!

I had blood test done around the first week of October 2018. I received an email from my medical aid that the were not covering the costs and expected to receive a statement from Lancet - which I didn't. I had to call to request a statement and the consultant told me my email address was incorrect however when she ready out the email address it was the correct address so first error from Lancet. I then received the statement more than once and almost every 3 days was receiving the same statement. I paid the outstanding amount on the 31/10/2018 and sent TWO emails with proof of payment and called into the call centre as well to ask when my email will be acknowledged and was told by the consultant that it will be acknowledged when they get to it. Today I receive a call from Nazeer informing me that my bill is outstanding????? When I tell him I paid then he is very quick to say the funds will take a few days to reflect but why was the email not attended to with the proof of payments?! Check the emails before accusing people of not paying their accounts!!!