Inconvenience experience of a Banking details and collection date

Hello everyone .I'm unhappy client of directsaxis...it's 3 months since I've called in and asked for my banking details to be updated and my collection date ,because I no longer use that account and prefer to be deducted on the 1st of every month ...the agent advised me to have enough funds of the 25th of May which was the normal collection date ...I did as advised ,funds was available until the 3 -4 of June until I called in myself and found out why it never deducted ...I decided to make and EFT payment myself ...until to this day ..it still try to deduct in my old account ..and once again I made an EFT payment ... What annoys me is that they have the nevre to call and say that I did not pay my loan ,were else they inconvenience me ....