It is unfortunate that the company decided to relocate after you signed the offer letter. In this situation, it is important to communicate with the HR department and explain your concerns about the new location being inconvenient for you. You can try to negotiate with them to see if there are any alternative options available, such as remote work or a flexible schedule. If the company is not willing to accommodate your situation, you may need to seek legal advice to understand your rights and options regarding the signed offer letter and any potential penalties for not joining. It is crucial to handle this situation professionally and ensure clear communication with the company.