No customer service for international roaming

To activate Cell C international roaming, Cell C recommends: (1.)Go to a store: I went to Cell C in Stellenbosch four days before my trip, where I was told they do not do international roaming activation, and that I should phone (2.) 135. Phoned, and the person who "helped" me, assured me everything would work: receive and make calls, receive and send sms's, I do not want to use cellular data whilst roaming. I am now out of the country, and cannot send sms's, or phone, but I do receive sms's and calls, so contacted customer service (3rd method recommended for activation of international roaming). I immediately got an email promising feedback between 24 and 48 hours. So far I have sent three emails. (More than 48h ago, 24h ago, and in the last hour). Absolutely no response. They have my email address, and I can receive sms's and calls, so no excuse for lack of response. I did say that they are not to phone me, (rather a cheek for me to pay international rates for them to fix their mistake) but if that is the only way, why not send an email or sms to that effect? I have been a Cell C customer for 17 years. This is the second time they mess up international roaming for me. Maybe time to change service provider.