poor post purchase

I subscribed to the 5G in Aug, it only worked for one week and then they was no connection. Its been over one month trying to contact them to fix this challenge and their network and technical department have failed. To make it worse is that the post purchase service is really poor, you can't call them. You can only send emails which they respond when they wish too. They called me a few times telling to to try out what they have already advised on the emails either to optimize or to set the APN settings. Eventually one of the agent advised me to cancel the subscription due to the fact that this problem cant be fix. This was a shock to me because its a sign of failure to resolve their own connection. Save yourself the money and stress dont use rain!