Hello respected members, could somone help me please and advise re how to proceed with the delay in my naturalisation application as it has now been 8 months since i applied

. Not sure what the delay is. I contacted UKVI customer services on 20th August via phone and an email. Haven't still received any response to my email but received a call from the UKVI customer services on 25th August saying the case is still pending decision. Don't know where to go from here tbh. Thinking about going to my MP (but not sure how useful that can be) or shall I just keep calling the UKVI customer services? Below is my timeline. Thanks
Eligibility criteria: 5 years tier 1 + 1 year ILR
Language criteria met: Life In UK Test + MSc Degree
Nationality: Pakistani
Method of application: NCS Manchester
Date of application: 8th February 2016
Payment method: Debit card
Date of receipt by UKBA: 12th February 2016
Date of acknowledgement: 17th February 2016 (email)
Date money left account: 16th February 2016
Date of letter requesting biometrics: 16th March 2016
Biometrics done: 19th March 2016
Date of approval: - (Still Waiting)
Date of ceremony: -
Date applied for passports: N/A
Date passports received: N/A