I don't think it's considered harassment unless they are saying illegal things like you will be sent to jail if you don't pay. Having an attorney will stop the calls usually. In some states, once someone is represented by counsel the party has to deal with the attorney. You mentioned in another comment that you don't have money to afford the house, so it might be a situation where you discuss loss mitigation options with whoever is calling from the mortgage company or loan modification.
This should not be considered legal advice, but rather simple information. You should consult a lawyer to review your unique situation. No client-lawyer relationship exists until you sign something indicating there is.
4 calls a day though annoying is probably not harassment because they are simply trying to collect a debt. You should consult with a Mortgage Foreclosure Attorney immediately not only to stop the calls but to save your house .
Has your home previously been foreclosed, and is this a debt collector trying to collect a deficiency claim? If this is the actual creditor, they can probably get away with making four calls to you in a day to collect this debt. If this is a debt collector calling, there may be a violation of the FDCPA. You should consult a local attorney that deals in cases involving the Fair Debt Collection Practices Act.
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