2nd Complaint -double charging - no change

I have complained before and now I am complaining again, seeing that nothing is being done.

We are being double charged for tests that was only done once. After my previous complaint I was contacted by a person from Lancet to get it sorted. She did her research and found that we were really double charged and she contacted someone to get it taken from our account. She said she would come back to me. It has now been a few weeks and I have not heard anything. I have sent her a few emails, but she is ignoring it and not coming back to me.

I do not understand how a company that is actually very important can be so pathetic.

I keep on getting messages that we need to pay that account, but I refuse to do so, especially seeing that I have prove that the tests was unecessary charged for double.

I would like to get this sorted. Please can someone COMPETENT contact me. I have all correspondence with everyone from Lancet and I have the lady's name who is ignoring me.