Extremely Bad Service

I receive an account from Web Africa every month for R644.00. They suspended my account for late payment since the 15 January 2020. Today I phoned 4 times to ask why I did not have Internet so they said because I owed R35.00 for a top up done in July 2018. This is the first time I have been aware of this. Why did they not tell me this 6 months ago and why suspend my account? I think this is disgraceful and I went through terrible stress trying to turn the router on after they told me to switch it off.