AliExpress complaint: I bought a radio gps system for my car

I purchased through ALi Express a gps radio from . TomoStrong Official Store
HD GPS headunit For Mercedes ML W164 GL GL320 ML350 ML500 X164 GL350 GL450 2005-2012 wifi bluetooth Car Audio stereo drouble din – 1G 16G Camera, Order number 8152926632377422. I came with out the proper hook up for my car, and no wiring instructions, just a general hook up for similar models, If I hook i have to take apart my wiring to hook it up, this is also hooked to computer power, steering wheel, and other wiring in the same harness, to my old radio. They want me cutting into those wires and hooking their radio up. I have spent weeks trying to file a dispute, I cannot fill out the paper work on ALiexpress, wit not avail, it will never let me enter the dolloar value, though it chows everything to the last cent. I have talk to the company they keep tellin to work with them. No I am working with me, and if I make a mistake i can blow the computer or other things on my car. I asked them for post paid and i will send it back. not you have to work with us??? is the only reply I get, ALIXPRESS on brings me back to the dispute part with customer service at all. even on the phone is goes right back to same on old. never allowing me to complain then it shuts me down. as I cannot fill the page out. Now I asked for the 100 time and says I can not longer submit my request as the time has run our for the money back on the product???? I do not know what to do… I sure hope you can help. I have never had this issue with any product I have ever had on Amazon, for any reason. But ALIEXPRESS i cant even get to talk to any one, not file any things for return a product. I am so frustrated with them. I cant ever file a d bad review, as not website seems to allow it? what is going on ,as I do not know