Change of billing date and new plan

I was going to try your method, but I have read some old posts, which suggest that by simply turning off auto renew, will not change my billing date. According to others and Smarty guides, I would have to purchase a new plan, then turn on auto renew, as Smarty billing is linked to when you purchase a new plan. I have read others who have tried it your way and they still get billed their on there original date. Wish me luck, if it doesn't work might leave Smarty as any method used is to complicated just to change a payment date especially in 2026.