I feel like i am scarned i didnt took a loan

i took a contract with them after they said theres a network coverage and it was on promotion and the network was not working at all into my erea i even told them but now they are busy sending messages to the lady that used to be my supervisor i owe them 400 not this amount they busy sending to her they need to stop harrasing a wrong perso and contact a client streight and i didnt take a loan it was a contact where i had to pay 400 now thy are telling me to pay 4000 money doesnt come from tree we all work hard for it thy need to know that and stop contacting wrong people tryn to embarase their client