What do I do about this?

I was hired a little over a month ago as part time I requested to work 3 to 4 days a week as I’m a college student and I also don’t necessarily need a full time job’s income at the moment. My team lead and coach said they’d work with me but now my team lead keeps pressuring me to work full time, pick up more shifts. I’ve told him I can’t and he has been consistently calling in and leaving midway through the shift without telling me and my department only has 5 people in it with 2 or 3 people working at a time. I get the work needs to be done but I’ve only requested to have 2 specific days off in February and I’ve been having 3-4 days off a week consistently since I began and denied the request to switch part time and it’s starting to feel forced upon me.

I was hired a little over a month ago as part time I requested to work 3 to 4 days a week as I’m a college student and I also don’t necessarily need a full time job’s income at the moment. My team lead and coach said they’d work with me but now my team lead keeps pressuring me to work full time, pick up more shifts. I’ve told him I can’t and he has been consistently calling in and leaving midway through the shift without telling me and my department only has 5 people in it with 2 or 3 people working at a time. I get the work needs to be done but I’ve only requested to have 2 specific days off in February and I’ve been having 3-4 days off a week consistently since I began and denied the request to switch part time and it’s starting to feel forced upon me.