walmart my family Mobile overcharge for two phones that have not been used since March 2013 belleville Michigan

 We brought our son and daughter phones through my family mobile at walmart.  Was told by sales man how good and easy payments can be made.  So we got the phone in Nov 2012 and the kids used them for 3 months.  made all our payments at the walmart where we brought them.  Every time we would get the message phone bills were due we would go in,  It is 3 blocks away,  every singal time they had a hard time finding our account.  so we showed them the message on the phones. So come Feburary we had the phones cancelled .  We gat a message saying we stilled owed 22. on phones so once again we paid.  Now Comes the 30th of May and a bill in the mail for 166.53.  we called asap to find out why.  Was told that no bills were ever paid and nor were the phones turned off.  I have tried everything on there web and even called many numbers.  Finally got through to a machine that told me I now owe them 75 more. Plus now the phones are turned off.  What is aperson to do.  Never, ever go through this company.