Best Buy failed to issue me my refund after I rightfully returned the unopened products in full compliance of the refund terms. Los Angeles California

Big Scam by Best Buy. I’m a loyal business customer who is being charged $3,733.48 and have no product at all. I was in full compliance with the return policy at the time (items unopened, and within 14 day = exception because item was shipped after 23 days to me + the extended quarantine return period.

I have been treated unfairly. On 3/15  I went inside the Best Buy store and ordered, paid for 2 iPhones. This is the day before America's official Covid lockdown and  business closures. They said it would take 3 weeks to ship to my business. I called back the next day to cancel. Manager says I have to wait for it to ship, cannot cancel now. When I go to the store to return it, they say to call 888 Best Buy for a UPS label, cannot return in store. Frustrating and deceiving but OK. I call and request a UPS label, then ship it back.

UPS Tracking shows received by BestBuy at their warehouse 4/16. I call customer service to inquire about my refund, they say check back in a week. My English language is not good, so I have my son call every week. Then we open a dispute. We wait and call back every week to check. on 6/16 the Best Buy phone reps say that I'm fraud and that I sent them an empty box. Obviously items were either stolen in transit or at the Best Buy warehouse. I've sent a letter to corporate to see if anyone can help here.  I go to the store, they say call. I call, they say go to the store.

 Now they have failed to inform me about this and now it's pass the 60 day UPS claim window. I talk to the store manager and the customer support. They have very bad internal communication with their team. I'm treated as a fraud now? This is not good.

Best Buy attempted to ship the package back to my business however it was returned to sender because of the business closure due to quarantine.  On the tracking report I was also surprised to see the weight discrepancy on the UPS tracking shows 1.20lbs when I returned to BestBuy.
Note: the weight on tracking showing 1.00lb. - Not good.

How many people interacted with this package before the items were deemed missing? And what is actually missing? Why didn't Best Buy make a claim at UPS in time?

Best Buy is a professional company, they should take care of the customer here.