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@spanka4perry wrote:
Unfortunately they have my husbands mobile number and have called him... And they know where we live.... Great!

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tell your husband to let their calls go through to voicemail.  If they leave a threatening message, even threatening to come over to your place, then keep the message and consider going to the police.  I am sure that if they got just one call or visit from the police to tell them to stop then that will put the wind up them and they will stop.  Tell them that you had contacted police (but only tell them that if you actually do contact the police, do not try to bluff them). Do not make any retaliatory threats to them, remain calm and cool.  Ask the police for an incident number and even tell your buyer that number.  If they threaten to report you to the police over the transaction then that will be bluff and bluster as police would not get involved in their problems with the eBay heater purchase, only the threatening behaviour over the transaction. 

Many people are very brave on the phone, and the internet (keyboard warriors), but when they are stood up to they back down very quickly.  They prey on the meek and mild and if you stand up to them they will probably go away and look for someone else to bother.

Be strong, don't let them make you feel like a victim, take control.