Your mistake now we have to pay

We are new clients, you did not activate our debit order, for 4 months you did not deduct any payment from our account. So yesterday i phoned my husband and told him that our wifi is off. He phoned you guys and you told us that there was no payments made. So we wanted to know why the debit order was not going of. We got no answer. You made a mistake from your side and now its our problem, we have to pay you R4000. My husband has a vert busy stressfull job, he cant look at his bank every day to see what debit orders did not go of. We asked to pay this of in 6 months and you said no we have to do it in 3. Again let me remind you, that Metro finer made a mistake and we have to pay for it! So we said ok 3 month is fine. The we asked the person we spoke to if they are going to suspend our line because of this and the person said no. But you did it in any case. I have a fist year student who could not do his work last night, I wirk on wifi every day i could not do my job. After we made an arrangment from a mistake from your side you still sespended or fiber and we have no wifi. We want answers and we want you to keep to your word. Fix this pls.