Webafrica - unauthorized debit orders - terrible servise

I am highly dissapointed with the terrible service I have received from Webafrica. I canceled my internet services with them in Jul 2021, last payment which was supposed to be end of Jul 2021. As confirmed in writing with their consultants more than once. Webafrica proceeded to collect a debit order from me at the end of Aug and once again it shows that they will collect another debit order at the end of Sept 2021. They have now even indicated that my Vumatel services have been suspended and that I need to make payment for it to be reinstated. The Vumatel router was returned after canceling the service and Webafrica confirmed receipt of the router. So how is it possible to keep processing debit orders against my account and suspend a service after it has been canceled and the router has been returned.