Bad service/ customer service

On 28 March I reported my internet which has been buffering for a week already. Only got a response from the Manager: Roxanne de Paiva on 3rd April. I explained I was having problems with my account and will sort it on 6th on a Saturday. She informed that the due date is the 7th. To my surprise on 5th. I got a message saying they've suspended my internet. I phoned and asked to speak with Roxanne , the manager. She was super rude and informed me to bring back their router or she'll charge me R600. It seemed as if i was speaking to a different individual i was speaking to on the 3rd. Her customer relations and retention skills as a manager were non existent. She denied ever telling me that the due date is 7th and threatened to pull recording which i agreed to but never got it. Instead received an email confirming my cancellation which I was happy with. At least she did one thing promptly.