How do i go about getting my totaled and financed car covered by an insurance company that let me get a policy with no collision?

The insurance company would not have required you to get insurance coverage, as it is an optional coverage from the insurer's standpoint. The bigger issue is that the company through which you financed the car would have required collision coverage because it was interested in protecting the value of the collateral. Therefore, it may have obtained "forced-placed" collision coverage on the car and charged the premium to you (through your car payment). If that was done, you would normally have rec'd notice of it and been given a chance to get collision coverage and produce proof of it. Furthermore, collision coverage would have to have been in force at the time of the collision; it would not be retroactively applied to cover the loss.