How to join two joined tables with inner query in linque?

select refCustGrouped.Extension,refCustGrouped.CreatedOn,users.MobileNo,users.Name,cust.Status,users.IsDelete							
					from  [there_crm].[therecrm_admin].[User] users 
							join [there_crm].[therecrm_admin].[Customer] cust on users.uID = cust.uID
							join (
											select top 1 with TIES refCust.cuRefID,refCust.MobileNo,
											refCust.CreatedOn,refCust.Extension
											from [there_crm].[therecrm_admin].[RefCustomer] refCust
											ORDER BY
											ROW_NUMBER() OVER(PARTITION BY refCust.MobileNo ORDER BY refCust.cuRefID DESC)
							) refCustGrouped on refCustGrouped.MobileNo = users.MobileNo
					where users.IsDelete Is NULL or users.IsDelete = 0 and users.rID = 3 and cust.Status = 'INV' or cust.Status = 'VIS'

var res = (from cust in CRMEntites.Customers
                       join user in CRMEntites.Users on cust.uID equals user.uID
                       join refCust in (
                       
                       )
                       where cust.IsActive == true && cust.IsDelete == false && user.rID == 3
                       select new RefCust
                       {
                          
                       }).ToList();