Bulb ignoring my comunications

Hi I have tried contacting you via email to complain about the fact that you have wiped out £200 to £300 credit to have it replaced by a debit of £90 and advise that you have now replaced the last 3 or 4 years of statements with one statement that backs up the debit. I have regularly gave meter readings as well as having smart meter readings yet it appears this is not sufficient for you to get costs right. I have also asked how to escalate my claim but you have chosen to ignore this. Even though you have confirmed that you have received communications from my email. How do I get a response from bulb I’m sure if I stopped paying you’d soon be in touch.