Terrible customer service

Purchased a new device the month-end of July from the Mall of Africa Telkom branch. Today I received my invoice and i noticed that I've been double charged on my account.

I called their customer service to inquire about this and the consultant I spoke to was not helpful at all. He told me that i would need to go back to the branch where I purchased my device and do my inquiry with them as they are unable to assist me.

I asked to speak to a lead consultant or manager and was asked to hold, I stayed on the line for approximately 20 minutes holding and the guy came back to say their team lead is currently unavailable and I should proceed to the branch where i purchased my device as advised.