Disgusting customer service/Retention department

I don't even think Cell C deserve one star....

My mom cancelled her cellphone contract in April. I noticed that there is still a debit order running from her account.

After a huge mission with Cell C customer service, I discovered that her upgrade was done incorrectly and they charged her for two numbers.

Cell C made the mistake, therefore a credit is due to my mom.

My first email was 11 September 2018. Today is 22 November 2018 - still not resolved... only promises that Cell C is working on it. (This is the Retentions department (The employee's name is Nurse) - I don't think anyone would keep their contract with a company that takes more than 2 months to resolve a query).

I have never ever received such bad service. I really do hope that someone will have the decency to try to sort this out as a matter of urgency. All emails can be provided.