Your former employer improperly treated you as an independent contractor. You would be well within your rights to file Form 8919. It sounds like you are already aware of this, but according to the IRS:
Workers who believe an employer improperly classified them as independent contractors can use Form 8919 to figure and report the employee’s share of uncollected Social Security and Medicare taxes due on their compensation.
You may want to contact your former employer one more time and let them know that if they don't correct their error, you intend to report them and file Form 8919.
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