I bought this phone for my mother so she would have both a corded and cordless phone. The cordless has quit working. We put a new battery in alittle over a month ago and it worked for a while. Now it will not work nor will it charge the battery. What can I do now? I bought this phone at Circuit City a couple of years ago and really can not afford to buy another phone for her. Can I just get another cordless handset for this phone?