rain ripping me off

am not sure how some business operate , the debit order for my monthly subscription didn't go through last month , and not because there was no money in my account but according to the sms i received from Rain this morning , was due to error on their side , that is all fair and well but I have a problem when they decide to share communication with me 20 days after the suppose error occurred, I believe (and this is from a "Technical person" point of view , your systems should notify you as soon as a day or 2 if when a debit didn't run , the system should flag that , nit after 20 days you coming up with a stupid sms telling me you going to deduct twice this month , whose fault is it that your system didn't notify you? i had money in my account for 2 whole weeks , now you coming with up with stories ? called the call center this morning and asked to speak to the manager because am not about to speak to an agent who can't give me answers but keeps on apologizing , I don't want an apology but want this matter resolved , don't ask me to pay double for your incompetence . still waiting for the manager to call me back , hopefully he or she will have answers for me , and please whoever you decide to call me back better know what they talking about because am not about to accept second class answers . Just know you talking to someone who know her way around the IT sector , so you can't fool me and tell me about the system reporting after 20 days that debit didn't go through , that is , should be an immediate functionality of the system to flag that there was a problem with processes which were suppose to run , so help me don't test me , like this second rate internet you providing

regards Josephine