Telkom fail to provide an invoice?

Despite all my efforts Telkom is unable to provide me with my invoice. Having been a customer 38 years I was able to download my invoice online until about 5/6 years ago when they upgraded their website. Since then I can login but am unable to view my invoice or balance. I have requested my invoice by email at least 6 or 7 times a year for the past 5 years. They send my invoice 1 or 2 months then NOTHING. I received November account and now nothing? I went online to request an email invoice but get error message "'cannot be completed -HD8GK". As I have cancelled my line to emigrate maybe they are giving me a free month???