incorrect billing and order duplicated

I am shocked at the service in the call center. I have called how many times and my query is not fixed!! Every time I am told a manager will call me back and doesn't. It seems as if the bad service is filtered from management to the consultant. Every time I call I am put on hold and no one returns. I spoke to a Precious before and when I ask to speak to her again I am told there is no one like that there.