Charged for services no longer provided

I wrote to Webafrica to cancel my services a month ago, I was told I must follow a link to the support page logging a ticket which I did,... again this month a receive an invoice for my email premium package, after they cancelled my services and transferred my domain...according to them I only cancelled a portion of my service....with no domain provided by them any more it is evident that they use their policies just to take peoples money...be aware when signing up with them, they have outgrown their specialist service, selling you empty promises, and are now only a money making business... I must again go to the same support page, cancel this service and pay again for another month for a non existing service