My grade was penalized because of a technical problem. Who can I contact?
I fail to see how a teacher could give you what you want, while remaining fair with respect to all other students.

I taught a course where I made clear from the start to everyone that late submissions would not be graded and would not receive any points. Around one deadline, one student decided to take a holiday in Portugal, which is located one time zone to the west of most of Europe. They submitted their homework three minutes before midnight in the Portuguese time zone, which was 57 minutes late in our time zone. 

If I now stretch up the rules for this student, why would any other student ever take my red lines seriously anymore? Moreover, other students who remained in the central European timezone may have missed the deadline by, say, ten minutes, and just decide not to submit given that I had been clear that late submissions would not be graded. If a professor writes down a hard, clear rule, they cannot make technical exceptions for that rule without un-leveling the playing field. It would be unfair to other students, to make an exception for you.

It would be different, if the university's online course tracking system to which you allude, has a formal role in the examination regulations. If there are university or department regulations that stipulates that the system administrates, then you might be in your rights. But barring that, the teacher sets the rules, and is responsible for upholding them in an objectively fair manner. Objectively fair would be to not grant you the technical exemption that other students would also not be granted.