Ecs mandate

Hi I have signed a ECS for the amount of 4100 with a STEM cell bank to preserve my son's cord blood and tissues. Every month 2mnd my ECS will pass in ICICI Bank. Last month due to my financial situation I am not able to keep the required amount in my account and ECS has returned. But the mandate has been submitted 7 times and got returned without my knowledge. I paid the ECS money on 23rd April through online payment. Again for this month (May 2018) to clear my ECS I have kept 6000 in my account on 2nd May and the bank has debited appr. 2500 as ECS return charges. There is no alert message from the bank regarding the debit. For this month too ECS has not been passed due to insufficient balance. Again today (4th May) I got a message from the bank my ECS got returned and again debited another 413 rs from my account. I have gone through the RBI site for how many times an ECS mandate can be submitted in an account for a month. I didn't got the answer. And is there any rule the bank should not communicate to their customers about the debits made in their account regarding the charges.