0 Bal Invoice

Invoices MTN sent me last month, April 2020, have a zero balance amount. I have tried contacting customer support through email, website contact form and calling 135 all of which I have had no success with.

The Call number 135 does not ever get through to a consultant, stuck on self service, I've even tried calling MTN Business to get an alternate contact number for accounts where a recording of office hours of 8AM to 5PM is played followed promptly with "Good Bye" and the line is disconnected this at 11:30 AM. No response from the email address found at the top of the invoice nor from the contact form found on the website.

Please can someone from MTN get back to me to resolve this issue.