Bag service from Vodacom fibre

My wife has a momth to momth contract with Vodacom fibre and we recieved the router on the 14 January 2021 with the agreement that the first installment ( pro rata included) will go off at tha end of February 2021 The 14 of February 2021 they disconnect our service. I phone them the 17 .18 19 and 20 February 2021 and nobody could tel me why. We decided to send back the router because we did not have any use from . The deducted the debitorder at the end of the month and send us a bill for over R3000.00 to end the contract because they said it is nit a month to month contract .I asked for the copy off the sighned contract but till today they refused to send it to me. After words they said that it is our duty to get the contract from the web side .We decided to asked the router back because they refuse to stop the contract (on my wifes name C Agenbag ID NUMBER ***) Vodacom said that I am not aloud to negotiate and that my wife must . From the 5 of March 2021 on a daily basis she contact them and every day they have a other story We have all their names and the different sr and cr numbers that they send us. Firtstly they said that the e mail address of my wife was wrong , bur how did they send the invoice trough on the correct e mail address. Then they said they could not contact her on a cancelled number . Last knight the agend told us to phone after 8 and when we did , every thing was closed. At the end of March 2021 the installment went off again and we pay for a service we don't have . Please we just want the router back to get service paid for