Venmo sucks

I have had venmo for a few years, mostly to contribute $20 to a retirement basket or whatever contribution pool at work or give a friend my part of a restaurant check. At the beginning of the month, a friend had her disability check delayed and I sent her $600 through Venmo to pay bills and eat until she got her check. She couldn't withdraw the money, so Venmo initiated a refund. On 6/5 it shows the refund is complete. My bank has no record of this refund. I contact Venmo support on 6/11, they just insist the refund was complete and to contact my bank. I send a screenshot where I contacted my bank and they said they had no record and to contact Venmo. Support said it could take 3-5 days, if I still didn't get it then they could run a trace. They said it goes through some clearing house so it could take a few days.

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I wait until 6/18, yesterday, contact support again. They tell me the refund is complete and to contact my bank. I told them my bank has no record of this, and they made me send screenshots from my personal banking app from the date the refund supposedly completed until that day. I did. They said they were escalating this to sn account specialist and they would email me. I contact Support again today, asking about my refund and when this account specialist would email and when they would run this trace on my money. They said the refund is complete, I have to file a dispute with my bank. My bank has no record of the refund to dispute, and the transfer to venmo was not fraudulent to file a dispute. My bank tells me to contact Venmo. Am I just screwed here?? I don't know what to do at this point.