Solve PMPro Wp plugin issue

We are facing below issues in PMPro plugin. IMPORTANT NOTE: Please don’t use live website for testing. If you want we will provide a staging website credentials and other details that are required after proper response and interview. • When user upgrades a membership plan old plan should be cancelled and then new plan should get applied. Right now both plans are getting active and user sometimes pay twice. • If by chance two plans are there and we cancel subscription from PayPal then both plans are getting cancelled in the website and as a result we need to make a manual active. • If plan is manually active, then when subscription is cancelled (by PayPal due to failure of payment) or upgraded from website then it’s not updating in the website. • If plan is cancelled in between user should be able to access service till month end or whatever his last payment is done. NOTES: We have PMPro 1 year subscription, so as a developer you will get access to post a queries that you want to submit to PMPro, if it can make your work easy. If you successfully solve this issue we will send you work on monthly or weekly basis also as we are finding a new developer that can help us as a support person, the regular changes will be of text and images changes only, new task or functionality will be sometimes only.