If the customer does not respond to your requests to accept your house rules you deny them service. GDPR is quite clear that "silent agreement" does not apply.
GDPR Recital 32, sentence 3: "Silence, pre-ticked boxes or inactivity should not therefore constitute consent." https://gdpr-info.eu/recitals/no-32/
GDPR Recital 32, sentence 3: "Silence, pre-ticked boxes or inactivity should not therefore constitute consent." https://gdpr-info.eu/recitals/no-32/