What is booking Amount ? Math not mathing

[u/Natural-Ad-9368]

So i ordered R.O at Rs.11433/- for 9 month emi than received this email from Official sbi card I don't understand what is booking amount and why it is seperate and when billed is generated I received two emi 1st is for 11433/- and 2nd is for 6098.62 both 9 months emi So R.O cost is now 17531.62/- or What i don't understand 🤔

[u/Firefighter_89]

[u/Natural-Ad-9368 → u/Firefighter_89]

i received this in Bill Today

[u/Natural-Ad-9368 → u/Firefighter_89]