Harrassed by Call Centre Agents

I have been harrassed by the Agent.. I made an arrangement for my credit card and constantly getting calls to pay other accounts which a prescribed, I have logged a query with ITC to dispute the balance they removed the accounts then boom they reappear.. I gave the guy my number only to be harrassed I get more than 5 calls a day.. it is like they are not going to stop until I acknowledge the debts which I will not do.. they are prescribed and I have a right to lodge a prescription as per the act.. please stop bullying me..