Bad service

I enquired about a tax statement on my MTN account more than 2 weeks ago. I was sent a Pair form which I completed and returned. I didn't receive feedback and after complaining was sent another email saying they can't find Pair form and I must resend it, which I did. I had 3 webchats with agents and so many reference numbers for such a simple request. Now after numerous calls and emails I receive an email asking which number I'm quering about. All I need is a tax statement for the last 2 years on my account. How difficult can that be? This is such bad service and so unprofessional.