I am about to be debited and I AM NOT their client!

Early last month, I submitted an application for a FLTE package. I did not take up the service and was told that everything was cancelled and the sim and device was not delivered to me, suddenly im getting invoices and statements. I then contacted your Twitter team and they did not respond, i contacted your whatsapp team and they responded 5 hours later then 4 hours later then the next day at 08:00 they have not responded since this morning and now im getting smss from Netcash to say a debit order has been submitted against my account. I did not take your services!!!!!!!!!!!