Roaming on telkoms network with a telkom sim?

I'm a telkom mobile customer but my lte inernet won't work on telkoms 65505 network but if I do a scan on my phone I do pick up telkom 4g but I have to buy all networks data to roam on telkoms network it not fare and I feel their robbing us, even my lte inernet with afrihost through telkom dint work but I'm roaming on telkoms network with a telkom sim ***