Can employer force employees to take leaves as per their guidelines

Hi, We are entitled to causal and vacation leaves (12+15). But the employer is forcing us to take leave for 10 consecutive days every calendar year. Due to this, we are not able to take paid leaves for family functions, personal emergencies and illness. We have communicated this to the company but they are saying that this is their policy and we must oblige. So my question is, can employers force employees to take leaves as per their guidelines? Is it not the right of the employee to utilize his leaves as per his wish? If possible, please quote law sections that uphold our rights on this.