Samsung India — samsung a30 apps not working

Dear sir,
I have purchased samsung a30 from a recognized store named "roy telecom', baghajatin, kolkata. The purchase was on an emi scheme. The emi was of 8 months. The emi amount should be deducted from my account on 5 th of every month.
They installed an app named samsung sure and all the above information are mentioned there. But, unfortunately this month (October) we had puja. Due to that, the bank was closed and the amount was not deducted even if i had balance in my account.
After the failing of emi amount, none of the apps were working. I couldnt even call or message anybody i firmly complaint against samsung and i think strict actions should be taken against this. This should not repeat in future. I had an emergency and was unnable to contact anyone. This is not done at all. This is not all, people from samsung have been calling more than 4 times a day and were saying about the money not cleared. Thats completely their fault. I faced a lot of problem and harrasment. This should not repeat in future. The purchase was on dmi finance scheme.
I am attaching some photos. Please find the same

Yours truly,
Moumita karmakar
C/o biswanath karmakar