Torched customer

This is the worst experience of my life I took a MTN contract with Mondo in 2020 not sure about the month, i called mondo on the same day and asked for a cancellation since it was the wrong package I followed up with an email few months done the line I have been receiving calls and emails from MTN regarding an outstanding amount this did not make any sense to me so I have been contacting mondo asking for an explanation but no clear response sent to me sending numerous emails still no response I finally decided to make the payment with MTN trying to sort this out and clear my name but seems like I was making things worse CSS has been calling me and harrsing me to make payment this has made a bad impact on my credit record and I only found out when I decided to take a contract with Cell C...it's really sad how we are being bul**** and companies failing to have better communication amongst themselves to inform relevant departments when there are changes

I am hoping that by using this platform I will be able to get assistance