I have been using CPAP supplies for over 6 years. My prior CPAP supplier, Globe Drug of Grand Rapids, MN went out of business, closed their doors and automatically transferred all accounts to Rotech Healthcare Inc, in the Fall of 2018. I have never had any co-pay or any other problems with my supplies until Rotech. What has changed?I do have unopened. factory sealed CPAP supplies which I can not use due to an allergic reaction in the mask materials. I now have to use a new foam type seal mask. I have offered to return these supplies to Rotech for credit, but Rotech will not accept returns more than 3 days. 3 day return policy? (It took 10 days from ordering before I receive Rotech supplies). Now, in May 2019, I am told I have a bill from December 2108? Co-pay, why do now have a bill? Why was I not notified sooner. (3 day return policy)I am certain I owe Rotech nothing. What a way to do business. As stated, I am willing and offering to return over $100.00 in mask and materials that I can not use. If Rotech has a 5 month bill delay, and a 3 day return policy, what gives? I since paid them, after getting terrible threats from Rotech.