Job resignation in a week of joining and not serving notice period

Hi, I joined a job week ago, company placed me in client company and in 3 days I came to know I don't have any interest in working with this job. So I called primary company and told I don't Want to continue work and want to leave but they convince me to work but today I emailed them by saying sorry I cannot continue and will not come to work from tomorrow ( I didn't inform the client company I use to work), my question is will they call me and force me to come to work and if I strongly say no will it will be a problem (both client and primary company I got hired). I have decided not to work from tomorrow please answer asap. Note: one month notice period I signed but I'm leaving work before starting only Thanks