Im on with VM at the moment,
It seems obvious to me whats happened, the billing links between Netflix and VM have failed, those that didnt have a previous netflix account have had their service cut off, those like me that tried to keep the existing account and just transfer the billing have been charged by VM and then when the billing system failed Netflix reverted to the previous billing system and took the direct debit.
VM needs to reverse their charges and resetup the billing link to the netflix accounts and fix whatever it was that broke it previously
Trying to explain that to customer service though is hard work