Money Control sent a bill to me that was 100% covered by Medi-Cal Riverside, California

I had a stroke and was 100% covered for all charges from all doctors by Medi-Cal. All of the other doctors and hospitals sent their bills to Medi-Cal and got paid 100%. For some reason Dr. Imdad Yusufaly refused to bill Medi-Cal and sent the bill to me. I wrote back to him to bill Medi-Cal and he would be paid by them. He still refused and continued to bill me. I wrote to him to stop contacting me and to bill Medi-Cal because I was not going to pay a bill that was fully covered by them. He

then sent the bill to Money Control collections. I received a bill from them. I wrote back to them and told them to bill Medi-Cal to be paid 100% and to stop contacting me. They put the collection account on my credit report.  The bill was for $437.