hitting a brick wall

<p>I am having a problem with the backup data sim card that I am using. I have an LTE router that delivers LTE speed with a Telkom sim card. However whenever I pop in the vodacom sim it cannot connect to the internet, let alone LTE. I am 300m from the vodacom tower, have excellent LTE signal through vodacom on my iphone. the sim is provisioned for LTE. I am having now joy dealing with this issue through the call centre. This issue has been going on for over a month. I can no longer deal with the call centre agents, they are there to fob one off and are completely ***********. this is a technical issue. Please can a technical person from the data section contact me to trouble shoot this issue. </p>