Retrospective effect

[PRD2021]

I have a term deposit account with your bank which has already been matured, but I could not get renewed my term deposit immediately after its maturity date.
Therefore, I request that you renew my term deposit with retrospective effect for further / another period of 13 months.

Please tell me if the sentences above are grammatically correct and appropriate.

 

[Tarheel]

Delete "has already" there. Replace "get renewed' with "renew". Delete "further ".

 

[emsr2d2]

"has already been matured"
"has already matured"

 

[Tarheel]

I wouldn't use "already":there.

 

[tedmc]

I have a term deposit account with your bank which has already been matured, but I could not get it renewed. my term deposit immediately after its maturity date.
Therefore, I request that you renew my term deposit with retrospective effect for further / another period of 13 months from its maturity/expiry date.

Please tell me if the sentences above are grammatically correct and appropriate.

See above.
Why couldn't you get your insurance renewed?

 

[SoothingDave]

You mean "retroactive," not "retrospective."

 

[emsr2d2]

If you've already been told that you can't renew it ("get it renewed"), why are you requesting that they renew it?

 

[PRD2021]

If you've already been told that you can't renew it ("get it renewed"), why are you requesting that they renew it?

I forgot to request them to renew my term deposit upon it expires.

 

[Tarheel]

I forgot to ASK them to renew my term deposit BEFORE it EXPIRED.

It looks like you have a problem.