New Tektro Novela Disc Brakes So two days ago I bought a brand new Carrera Sulcata MB. Ever since it came out of the shop the rear brake rubs constantly, but only on one side of the caliper. I've tried realigning by loosening, holding brake and then tightening, but to no avail. I also tried holding the rotor/calipers in a position where they don't rub, but as soon as I tighten the allen key bolt it goes back to rubbing. It doesn't rub when it's not tightened fully but I'm not sure that's very safe. Now they have started to squeak at a certain point of the rotation (very loud) - do I just have to let them bed in or is there anything I can do beforehand? It's quite frustrating.

Thanks!
The brakes are mechanical brakes. Normally (I don't know this brand) the brake lever moves one side of the pads only and pushes the disc against the other. When properly adjusted the disc moves very slightly into the non-moveable pad.

Normally the pad that move is the outboard pad, and the fixed one is the inside pad. To adjust you probably need to unwind the inside pad 1/4 or 1/2 turn, and maybe readjust the calipers. 

Refer Here for some good instructions.