First of all, as you seem to be aware, your managers may call you on day off. The law does not require vacation days or days off to begin with; it's up to an employer to set schedules and determine days off. Similarly, an employer is free to contact an employee on their day off, that is so long as this is not prohibited by the terms of a union/collective bargaining agreement or employment contract. As for getting compensation for work done when you are out, if you are a "non-exempt" worker (i.e. typically one who is paid hourly), you should be paid for any time you spend working and being on the phone with manager/repair people, etc. counts as working. Additionlly, yto the extent that such timeputs you over 40 hours in your work week, you are entitled to pay at OT rates.