Disgusted after major service

<p>I took my car for a major service at BMW autobahn in Isando which cost me close to 6k. I asked to receive old parts back, forgot to check but realised It was not there. Noticed a few days later that my car was leaking oil, which it did not before the service. Oil that leaked out was pitch black (was it actually changed???) I was told that its unfortunate because some oil filter housing or seal might be worn out. I believe its poor workmanship. I have to book my car in again to be checked and I am sure they will come up with a story to get money out of me. I was charged for a car wash but my car came out dirtier then when I took it in. I am very disgusted with the service I received at Autobahn BMW in Isando Kempton Park.</p>