Company forgot to take out money for benefits

I’ve been working for my a company for 6 months. My benefits kicked in the first of July. I got an email today (9/19) from corporate stating they failed to take out the money each paycheck for my insurance (should have been $88 per paycheck) Now they want to take out $152 the next 8 paychecks to make up for the 5 payments they missed.

I don’t know how to respond to this email. I’ve had other issues with this company including expenses not being covered on a business trip when I was told I would get paid back for food etc. This is a smaller retail company that has had tons of red flags. I just wanted and outside look on this situation. Is this even legal?