MTN using Covid Response for Excuse for poor service.

MTN Covid Relief or rather used as excuse for poor service. I have been logging queries with MTN as I never received my June 2020 Invoice. I need the invoice for work purposes. I finally received an email asking security information before the would send the invoice to me. I rep**** with all the information and still did not receive the invoice. Previously when this happened I had to wait a full month for a response and this was before the lockdown. Now that everybody is working from home it may be even longer.