Cut off my internet without warning that my payment was late

I missed a payment for my fibre and they cut off my internet 12 days later without a warning email or phone call. Then they expect me to email them proof of payment to turn it on! I phoned their accounts department and this Internet Service Provider says they don't use the internet for warnings, but they send an smses. I don't own a cell phone. Also, when you sign up you have to accept their quotes via email or sms. The email acceptance doesn't work.