Air India — Non compliance of pre booked seats

Address:	Bhopal, Madhya Pradesh, 462031
Website:	airindia.in

My mother 56 yeras old mrs jyoti dubey a case of carcinoma thyroid and my father mr rk dubey 64 years old, senior cetizen and patient of ihd post cabg travelled by ai 437 from delhi to bhopal. I have chosen seat 4a and 4b for them, but they were allotted seats 7a and 7e. No reason given. Tkt no[protected], and[protected]. I want to know who were "more deserving" passengers who were alloted seats 4a and 4b and on what basis? Air india should not give a optiob to choose seat or if given they should respect it. I seek clarification for this reckless and uncommpassionate behaivour.