Re-activate my roaming urgently!

I have default roaming. I've travel before with no problems. This rime I activated the travel saver on my app. With no response. Then when I check with vodacom they deactivated my default roamibg and suddenly want a deposit . ******. I've travelled several times before. They never asked for a deposit. Call center can't help only back office staff who you have no access to. I need this activaTed immediately !