This topic appears from time to time on TTOL. First thing to do is to discuss your timeshare agreement with an attorney. Most likely you will be able to either sell or give it to someone, or walk away by notifying whomever you purchased it from. If it is a SXM timeshare even if the resort is owned by a firm in the US, SXM laws prevail. If you purchased a timeshare that you bought in US for a US property that you trade for SXM TS you are bound by US laws that are different and again the attorney will provide valid advice.
My timeshares are SXM owned by New York company. Let me assure you that if I decide to discontinue mine I will not be paying anyone a fee to sell or rent my units to others.
Even if they enter it on your credit report, anyone viewing your report will recognize it as a timeshare entry that has little significance if the rest of the report is healthy.
I've done some homework on this one and am confident that no amount of intimidation would affect my course of action.