Nipples permanently erect after over 1 and half years since surgery?

If it has been 1.5 years since your surgery it is unlikely that anything will change in this regard.

Thank you for your question and I am sorry that your results have not been what you anticipated.  At over a year from surgery your current results will not change with time and will likely require revision surgery. The cause of your high-riding implants will need to be determined, such as a tight implant pocket or capsular contracture, before the appropriate treatment can be recommended so see your surgeon for an in-person evaluation or seek a second opinion from a board certified plastic surgeon closer to where you live.  Hope this helps.