RCS Group Registered Credit and Financial Service Provider Debit Orders

I just want to make a point of RCS. I changed my bank inforamtion a few weeks ago. I called RCS to change and they told me to send all relevant documents to *** and they confirmed they recieved this. I received a sms my RCS CTM debit orde did not go thourgh. Today they called my asking what's going on and I asked them why did they not update my banking details, they also told me they are not aware of the email I have sent. RCS IS LYING TO THEIR CUSTOMERS, NOT UPDATING THE INFORMATION AS REQUESTED. I will not be help liable for the lack of service they are doing. What a disgrace.