Solar FIT - EPC Certificate date issue

So I've bought a new build property with Solar panels fitted.

I've sent BGas all the info req for the FIT (feed in tarrif) to get paid for the energy I generate but dont use and have now been told...

"As per OFGEM guidelines all installations must have an EPC certificate dated before the date of the installation. As your EPC is dated 11/03/2016, you will now receive the lower tariff rate"

So basically because the EPC cert if dated a month after the MCS cert (mcs/install cert dated 26/2/16) I get put on the lowest tariff ! As my house EPC cert is a B I should be on the highest tariff, and its a massive difference between the two
So I've asked Bgas how I can resolve this without a time machine and they said they didn't know (what a surprise) and I went on the Government gateway and found and contact 3 local EPC assessors all who dont really know how to resolve the issue apart from telling me to contact ofgem

So only way round this I think is to get new MCS certificate one with a fresh date on if poss. The name of the company who installed is on the cert so I will try contact them.

Any one else had this issue or point me in right direction to resolve???

Seems petty over a date a couple of weeks apart