Sales blunder from Telkom.

I requested that an ADSL line be installed at my residence in May/June 2016. This was done successfully, until I started being billed for an unknown number this year. This unknown number is linked to my residence and the bill is coming off my account but seemingly no one from Telkom has taken their time to investigate this. I have spoken to numerous consultants from 3/11/2017 but to this day, this hasn't been resolved. I called again this morning and spoke to Adam, who actually took his time to check this for me, although he couldn't do much from his end as this is apparently being investigated. Will someone from Telkom please tell me why I should be the one always calling to follow up on this, and each time, I get told a different story, promised a call-back but none of this happens. I have wasted so much time on the phone with Telkom consultants, who mostly don't want to take ownership of my query, instead I get shoved from pillar to post and it's become a real nightmare. Telkom has billed me for this unknown number but now it's a mission for them to investigate the cause and refund me. Wow. I can't believe how my query has been handled. This is probably the worst service I've ever received in my entire life, and mind you, I'm paying for it. Telkom, how disappointing. Do all your clients have to run around this way? Appalling indeed!