Rain is unfair, please advise where so i report them. Rain=Pain

when you activate they ask you to pay upfront, recently i have paid my monthly subscription and changed the debit to the 1st of eah month, only to be disconnected on the same month to be told that i need to paid again as my debit was changed to the 1st. had i not changed i would still be connected. but their system is not wise to even advise us that changing will result into this... but still it doesnt make sense to pay on the 25th, change the debit date on the same day and to be disconnected 5 days later due to nonpayment. what is their ombudsman? i feel ******.