Klaviyo: Email Marketing & SMS

I would give a 0 if possible. DO NOT SWITCH to klaviyo. We have been in business for 9 years and when we switched to K, our 60% open rate dropped to 20% and all of our emails land in SPAM. All they could say was it was losing consumer confidence and we have to do their "reputation repair" Klaviyo totally screwed us on all big sales. Any one have any idea who else would be a better alternative? Need to get out of klaviyo ASAP