Blocked from Customer Care - Haven't called them is weeks.

I tried to call Vodacom customer care to verify that the subscription that they botched and I subsequently cancelled was, indeed, successfully cancelled.

I haven't called Vodacom in weeks, but my call was blocked due to "unusually high call volumes from my number".

So they blocked me and may potentially be deducting money from my account. I don't know, I can't reach their customer care to verify. So what do you call customer care that doesn't care about the customer?