Long-term loyal customer, zero answers and told to switch off my own service

I’ve been with Cell C since 2014 and until now, I honestly had nothing bad to say. Same contract for so many years that I can’t even remember the original term — that’s how long the relationship has been. Now suddenly, 30GB of data disappeared in 7 days on my number. I queried it, reasonably expecting an explanation. Instead, I was told Cell C cannot explain where the data went because they don’t have access to that information. Let that sink in. The proposed “solution”? Suspend my SIM card until I can physically go to a store — meaning I cannot make or receive calls or use the data that I am actively paying for. That’s not a solution; that’s punishing the customer for a system issue. After nearly a decade of loyalty, I expected transparency and support — not guesswork and service suspension. I’m paying for a service that I’m now being told not to use, with no accountability for unexplained data usage. I’m looking for: A clear breakdown of where the 30GB went - A resolution that does not involve cutting off my service Loyalty should count for something.