Animation Deformity- Botox

Hi ladies, I have had a double mastectomy with immediate reconstructive surgery with implants under the pectoral muscle. I have developed breast animation deformity, with spasms and pain. I have read lots of medical articles that an option is to have Botox injected into the pec muscle to stop the spasms. I am wanting to know if anyone has had this treatment? And can recommend a specialist. I’m in Qld and having no luck trying to find a specialist who will do it. My plastic surgeon has recommended it but doesn’t know who would do it, and whether it would need to be done under ultrasound so to avoid puncturing the implants. Any help would be greatly appreciated. Thank you.