When did you cancel the plan? If you had insurance through the Health Connector and received an Advanced Premium Tax Credit, during the time you had insurance, it is possible that you would have to fully repay all of the credit when you file your taxes due to your income for the entire year being more than you estimated it to be when you signed up for the insurance. So even if you only had insurance for January and February, if your income for the year says you didn't qualify for the Advanced Credit, then you would have to pay it back which would cause you to owe the IRS.
When you enroll in a Marketplace plan you are asked for your estimated income for the year. This is what they base your Advanced Premium Tax Credit off of. If your household income is more than 400% of the Federal Poverty Level, then you will be required to repay the entire amount of premiums that you received in advanced that you were not eligible for. If your household income is less than 400% of the Federal poverty level, then you may have to pay back some but not necessarily all of the credit you were not eligible for that you received.
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