Hello and welcome,
Normally you must be principally involved in selling the employer's product to be paid commissions, so if the tech work is a substantial part of your job, then you should be paid hourly for that time normally.
File a complaint with the state labor board if you believe you are not being paid properly.
Here is a link to file a complaint:
In addition, you must be reimbursed for all of your employment-related expenses, which can also be investigated by the labor board.
Here is a link with more information on this issue:
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