Refund deposit (pretor group)

I had a very bad experience with pretor group I recently moved out of their bachelor unit , I left the place in a good condition , nothing broken & very clean They also did an inspection I've been waiting for my deposit refund of R4350 but instead they paid R943 & they are refusing to give me the rest claiming I shouldn't even get a cent , it costed me R11050 to open the place including admin fee & water and electricity connection I tried taking up with the owner but she can't help me I don't know what to do