If your disc brake is rubbing, you can easily adjust it. We are in process of creating a video for it. In the meantime, have a look here (minute 1:40).
You loosen the two top bolts without unscrewing them. pulling the brake will center the caliper over the disc. snug the bolt, release the lever and check if that resolves the rubbing. If it does, properly torque the bolts to 6 N.m.
In order to adjust the distance between the brake pads, use the small screw sitting on the side of the caliper. See picture below.
In case your rotor is bent and unless you have a severe wobble in the disc, we would actually recommend you try truing the rotor first to see if that will be sufficient. Any smaller wobbles can be easily removed. You can use a tool like this: https://www.youtube.com/watch?v=O0c2Ez2v0PU
Bike shops in your area should be able to help with that as well.
If you are not able to resolve it as per the above instructions, we can certainly provide a new rotor.