Cannot Access Trading Platform

I have previously registered and was able to access this online trading platform. However, for whatever reason I now cannot access this platform. I receive an sms telling me to contact their call center to activate my account. This activation was already done a long time ago. Nevertheless I call their call center. and after waiting and going through all their options, only to have the call cut off. This occurred more than once. This is so frustrating. I never have these issues with other trading platforms.