SADV Horrible Service

my name is faraaz shaik, i installed fibre in my home in april 2020, today my account was suspended again with no notification of why it was suspended. i called today was on hold for atleast 20 min each time. I had no exact answer as to why my account was suspended. A Manager was suppose to call me but up till now which is 6.30pm in the evening i have received no feedback. This service is ridiculous and unacceptable. I have proof that the activation fee and monthly fee was paid for April on the 4th of May as indicated on their invoice/ statement which was paid via debit order... what can i do???