Unprofessional consultants

Hi I requested a cancelation on 1 of my devices ***) and they said it was sorted but monthend I received an invoice billing us for both the devices.of which I paid for the one they shouldn't cancel, so today I woke up to find out they have suspended the device that I have paid for.i won't be paying for their unprofessional service.i want my paid device active.n the above mentioned canceled.