Gap Cover Debit order inconsistent

My Discovery Gap cover was suspended due to a debit order that didn’t go off. The previous two months my debit order went off just fine but now this month it doesn’t and they suspend my account. I couldn’t get ahold of anyone on the call centre, it just keeps me on hold for several minutes. I emailed and was informed they would force the debit order again and if it doesn’t go through they will terminate the service. I find this to be extremely unprofessional as this is a fault on Discovery Gap covers side, I have the funds available and it should’ve been debited as per the previous months. I will be cancelling this service as soon as possible.