Brake Pedel Sinks To The Ground (Plz Help

kuyo

So I've been going crazy trying to fix my brakes!
I first got the brake fluid low light coming home 1 night, not paying attention I topped of my brake fluid with the wrong fluid.
My brake pedal started going to the floor like a clutch...It was time for new brakes anyways so I bout 4 new EBC rotors and front brake pads. Was to lazy to install them so I got all 4 rotors put on with brake pad change and a brake fluid flush for $150 at a shop down the street which i though was a steal. 2 days later my brake pedal starts to go to the floor again. A little bit more braking than before but it still sinks to the floor...Do I have air in my lines or is the problem still from adding a tad of the wrong brake fluid??? Was told by my club that the seals inthe master cylinder may probably need replaced. Just trying to confirm before I spend more money and still get the same results...

Any advice will help