Changed debit order date without consent

I called ABSA in the second week of December, to negotiate the interest rate of my personal loan. The consultant advised she will log a query for me and get back to me. Nobody called me, neither did my interest rate change. You guys did however changed my debit order date from the 25th to the 24th. I called the call centre today and have been put through so many departments, because no one can seem to change the debit order date back or find the query about the interest rate. Please can you assist