Continued incorrect billing date

Mannatech SA has billed my account again on an incorrect date which was changed a month ago from 25th to 31. Last month when I contacted them to cancel the incorrectly dated billing, I was only responded to 2 days later claiming that the goods had already been dispatched and cannot be assisted, that I should fill a return form. On receipt of goods, there is a clause stating a charge of 10% on returns which was never highlighted. The bill went through again from my account still on an incorrect date.<br> <br> I would like Mannatech to cancel the order immediately without any charges to my bank.<br> <br>