Oil drain plug stripped by dealer, advice from experts needed

[holmz20]

I wanted to share an experience I have been battling with for one week now with no help from either dealerships. BMW of Austin dealer ending up stripping my oil drain plug on my 70K X5 last week. I took it in for a normal oil change and received a call an hour later that the oil drain plug was over torqued by previous oil change service . I bought the car a year ago and rarely put 9k miles since then since it is my second car. BMW momentum west Houston was last place of oil change. Overall had no luck by calling service manager of houston , service director with them not taking ownership. Placed calls all day today to Bmw of austin trying to get them to talk to Houston to have someone pay for an $2800 oil pan replacement i was quoted.
Originally after austin took screw out stripping aluminum oil plan, they retapped with Timesert screw yesterday. I have called client relations which i see no luck with. I am now trying to figure out approaching corporate owners of Momentum west to take responsibility.
Left with no choice, have 3rd party Warranty Solutions with no claim yet which cover oil pan but Bmw of Austin has mentioned most likely the warranty from them will be declined after warranty company heres story of why oil pan is leaking.
I sent an email to Bmw momentum west right now as well which is below.

Hi Maria,
I received your contact information and wanted to describe an issue which I am not having any resolution to. My 07 X5 received an Oil Change service from BMW Momentum West early last year. Since I dont drive the car much I just performed an oil change here at BMW of Austin since I live in Austin. I was advised when i dropped the car off last week on friday 4/20 that my oil drain plug was really tight and that I might have an issue with the threads getting warped if they unscrew the plug. Bmw Austin I contact my previous dealership which was your dealership and talk to the service manager. I made the call and authorization was received to change the oil drain plug out and retap the oil plug by Cash, the service manager. BMW of Austin did note if the issue is not fixed this could lead to having to replace an oil pan due to BMW Momentum tightening the plug by over torqueing it. The dealership changed the plug and I drove the car home to find out it was dripping oil now. I have been trying to get a hold of the service director to get the issue escalated for someone to take ownership to resolve the issue. I have had no luck this far after tirelessly making calls all day since 9 am until 6 pm to come to a resolution.

I was left with no choice but to email requesting your advice and help in looking into this matter. The oil pan replacement is costing $2800 to replace which clearly I have no fault from my end. BMW momentum west authorized this request and I feel since they were the last one to service the vehicle that they stand behind their customer service. I kindly request you to look in and help me on this.

Any advice from you guys to approach this mess would be helpful. I shouldnt have to pay for an oil pan for this mess!