Horrible service from Cell C home fibre

I've been a cell c home fibre client for nearly 2 years and constantly get issues with them, first they have not been debiting my account as I've set my card for payments for over 10 months. They don't send my invoices, which led to me not knowing that my debit orders were not being paid. I finally made a payment of +/- R2500 to reactivate my services only to be told that I've failed the credit vetting.... How do I fail the vetting when they ****ed up on their end.

Sort this out ASAP