I had a family emergency and needed to take a personal call from my father for 90 minutes during work against family policy. As a result, I was disciplined by my supervisor for failing to punch out during the call, as well as for taking long breaks, and being late one day. I had never been issued a warning (verbal or written) for any of these other behaviors, and many of them are things my coworkers have done without any consequence (we take breaks together at the same time).

I feel this is unfair, but at the same time I know that I broke the rules (albeit due to a personal family emergency). I want to address this selective enforcement, but would like guidance on how to judge what an appropriate response would be. How should I go about that?

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Some background:

I was suspended and sent home because of my failure to clock out during a family emergency. During that emergency, I had a 90 minute phone conversation with my father.

When I discussed the offence with my manager, he told me that I was disciplined because I was late one day, I take long breaks, and I violated company cell phone policy.

Here is some additional background information:

* I worked the evening shift for 9 months without any issues. Eventually, they moved me to the day shift. After the transition, I came in late a few times, but I was not the only one.
* After the transition, I took breaks with my coworkers. We resumed work at the same time; but I was the only one cited for taking long breaks.
* Everybody makes cell phone calls. I had a family emergency.
* I had no written warnings before the official discipline.
* My manager never told me that I was violating company policy.

1 - I had not been issued any notice or warning before. No procedure was followed. My workplace has an HR department and all the handbook rules and regulations. 

2 - We work building to building and we use personal phone for making contact with managers and supervisors. Also there is only our personal phone to accept family emergency calls. 

3 - I am in lifting team and we have been told to take extra breaks if needed because some time we get real heavy stuff. 

4 - Maybe our body can fight for 3 months to change sleeping schedule, but our families can't, and we didn't decline to go for morning shift for 3 months.