Medical aid paid for blood tests in August 2024 but Lancet has not settled accounts to date

I had conducted weekly blood tests since March. There has been back and forth with Lancet and the medical aid but the medical aid settled accounts at the end of August. I submitted the remittance to Lancet but Lancet still has not settled the accounts as per the remittance. Lancet in July changed the pricing of the blood tests that were done in March and back dated the pricing on their side but the medical aid already processed the payments on the pricing initially submitted. I have followed up with Lancet about 2-4 times a month since then as they continously send me statements. Lancet has not handed these accounts to debt collectors who contact me.