Someone
You can’t. Sorry.
If the datas are in the nature you can’t regain it. If it’s a real danger for you the best you should do is try to invade your name address and everything with a lot of false infos. This will not resolve the spam problem but might save your life literally in others cases
You will always find problems associated with every thing but here’s some recommandations :
For a good start, Signal and his forks (molly…)
For daily basis and better than Signal, choose SimpleX (SimpleX is only feature incomplete for the mainstream app, but in it you can send texts, voices, photos, videos, live messages, have a PP, a alias for your contacts…)
Important stuff and activism, use Briar