FAMILY PROBLEMS.....!?

Your aunt is being very immature and petty. You think she would have had more respect for your grandmother than to do this to you. My suggestion, the next time she calls simply say, "Aunt x, I know this is you, I've always known it is you and this is getting petty. Im not going to change my phone number so get used to it." If that doesn't help then the next time say,"Just so you know, I talked to the cops after the last time and now all calls coming into this house are being traced. The police will be in touch, thank you, have a nice day."