Extremely poor service from Supersonic

Extremely poor service from Supersonic. I am writing on behalf of my daughter because I was sitting next to her throughout all of this and seeing her struggle to get things done. Not to mention that every call was approximately 20 minutes plus. On 20 April 2022 she sent an email to cancellations to cancel her account and gave a months notice during the month of May. On 26 April she followed up and nothing was done. The lady promised to send it to cancellations and informed her that they will call her back. On 13 May the same thing happened once again. Nothing was done. On 24 May the process was repeated. At the end of May she received a message to inform her that the debit order will be deducted on the beginning of June. On 2 July the guy promised to cancel her account and that he was very sorry for the delayed response. They will solve the problem and refund her within 21 working days. On 4 July I phoned about the refund that was not received up till now. Nobody knows anything. Now we must wait for the finance department to call back and nobody knows when. How can we believe their word after everything that has transpired? How is it possible that multiple people told me they would resolve the issue, yet nothing has happened?