If the dealership is claiming this happened, you should:
* Get a second opinion: Take your Jeep to a different reputable mechanic for a diagnosis.
* Review the repair order: Carefully examine the repair order to see exactly what work was supposedly done. If the cutting of wires isn't documented, that's a serious red flag.
* File a complaint: Contact the dealership's management and express your concerns. If they are unwilling to rectify the situation, consider filing a complaint with your state's attorney general's office or the Better Business Bureau.
* Document everything: Keep copies of all communication, repair orders, and any other documentation related to this issue.
The dealership's claim is likely an attempt to avoid responsibility for damaging your vehicle. Insist on a proper explanation and a complete repair at their expense. Being stuck in second gear is a serious issue, and their explanation is utterly unconvincing.