Billing is unreasonable and no way to contact them anymore

I just got back to the country and the call charges are way too much, like R20 affords 5-6 minutes local number?? I tried several times to contact the call center with no luck, on 135. How on earth do we reach this service provider?

The "chat to us" option is a total waste of time, no one replies!

Another problem I had was them taking my R29 while I was abroad roaming, when I bought data without knowledge that I cannot even use it. My number was on international roaming yet they sold me the data so I can't use it? It expired because I was told there's nothing that they can do on Twitter!