Harassment

Bunch of fools work in this company, they are harassing me calling me 100 times, told them many times I don’t want a cellphone contract at the moment, they calling me 100 times interrupting me while I’m at work. Wasting my battery phone. I can’t switch off my phone to avoid them , I don’t owe them nothing. I cannot take the Harassment anymore and I’m willing to take this matter further