Lost my study mojo thanks to them

From day 1 all they care about is money. 3-5 SMSes and e-mails per day with this discount proposal, then they call you at inappropriate times as well. I always paid my account before or on the last day of each month and still they will call or even send an "Account Overdue" SMS. How do you study with these constant interruptions about payments or discounts? I lost my determination to study, I just want to get rid off these SMSes, e-mails and calls so badly that I now accepted the discount just so I can never, well hopefully never, hear from them again. I have 3 months left to final exam and quite honestly, I don't think I'm gonna make it, just really lost the "lus" to study because of the irritation.