Vodacom Tried to **** me

Vodacom tried to **** me. In 2022, I took out a home internet contract with Vodacom which worked well for the first few months. After a few months, the router would not allow me to go onto the internet and we came to an agreement that I cancel the contract and return the router. The router was collected by their delivery partner. To my surprise, I recently received a draft summons from Vodacom with regards to money owed by me. I contested the summons and upon investigation, it was actually Vodacom that owes me. They agreed to send me the paid up letter and refund my account within three days. Three days have long passed yet they haven't provided the refund and haven't provided the letter. Their service is sickening. I keep getting told to wait when I enquire, I'm starting to believe that they won't refund me