Frustrating dealing with Finchoice

Having to complain first before I get assisted is really frustrating , I got a mandate on my bank account and I rejected it , only to wake up in the morning with an sms from my ban saying the mandate has been successful, I called my bank and they told me it’s showing that I rejected it but it went through since it’s showing under my debit orders however I don’t know how Finchoice managed to make it a success when I clearly rejected it , something about Mobi money , I called the customer service (Finchoice)and I spoke to a lady called Kim , she told me she was going to cancel it because I told her I don’t want it hence I rejected the mandate , she told me it will be cancelled and it take 2hours , however after speaking to her I received another sms saying “congratulations your mobimoney is active “ can this please be cancelled I don’t want coz I clearly said I do not want it , remove it under my debit orders