kimo

Today I went to BMW specialist, as my back door light wasn't working, although the bulb was working, so the guy went and checking the fuses in the glove compartment, now the car was turn off but my daylight working and radio on and the door were open, so saloon and door lights were on, after a while, he told me that battery died, because of that, after trying so many times jumping the battery it want start, told him i think he was putting the negative clamp in the wrong place, still didn't start. I suggest try it from the battery in the trunk after a while the car started but my dash board light isn't working and I can use my transmission. We reset the battery and tried again same thing. Tried to read the codes but its seems the OBD port isnt reading my car. I felt so pissed, told them I will tow it to another garage, they told me they will try tomorrow with another cable.
Does anyone know what's wrong. This really sucks you go for easy problem, end up with that.