Double debit

I made an arrangement to pay my December fee at the end of January and the agent said she set it all up and it was all sorted January came and they only debited half of what we had agreed on A few weeks later another agent called me and I told her about the arrangement that I had made with one of her colleagues and she couldn’t see that arrangement so we had to make another one. We proceeded to make another arrangement but now this month end im being debited 3 times for the same account. It’s frustrating when it seems as if people don’t know what they are doing.