Worst service

I would like to express my frustrating experience with rain , I have been with them for 3 to 4 year now never missed any payment, I even have record of invoices, so last month which was January on the 18th I decided to cancel the subscription and I gave them a call since my next payment date was the 25th , to my surprise on the 23rd which was Sunday they switched the internet off without any communication with me which made me suspect they would want to debit and I quickly froze onlin payments on my app , when I logged in to myrain the front page had a massage written in bold and orange that I owe R589 mind you I have already told them to collect their router cz I'm canceling my subscription , now they say I owe R1168 I mean how so because I gave them an early notice to cancel and collect their router, now I get insufficient funds sms which costs R1 , this is very unacceptable from these guys