International roaming and customer service

International roaming is extremely expensive but my issue is with the small "reoccurring" that you don't see until afterwards and there not being a place on the app to cancel this. There just isn't a button and customer care cannot see what you pay for on your account. When I try to deactivate roaming on my My Vodacom App then it gives me a 424 error. USSD gives an error too. Chatbot and an agent can't help cause they say it has nothing to do with the app. Then when customer care calls you they charge you! They gave me the missing 100 in airtime but I've lost 40 South African rands on the call and then another almost 20 from missed calls after I tried to find out if my roaming is deactivated! I didn't request they call me but every time they miss call me it charges me! Fix the useless billing page as it doesn't state what's being charged for and I've been charged for unclear reasons. Very unfair and I will be switching service providers when I get home. this has made my international travel very uncomfortable.