cashback cheque not arrived (no email or specific receipt code for form ?)

[#1]

HI,
      I signed up for plusnet Nov 3rd with the customer id pauljm.
    I completed and submitted the £50 cashback form within 2 months on 14/12; using link from email
https://www.plusnetcashback.com/CashbackClaimResponseDetails.aspx?ID=pmyvnWTtu/wW/AHows****==
I have not yet received the cheque is this usual ? 
The system did not provide an email receipt which I had expected, although this
Was not discussed on the faq page. https://www.plus.net/home-broadband/faqs/cashback-and-vouchers/
I Just saw a generic confirmation screen.
I do have a screen capture  of the form and the explorer history record, but that is all !
Regards, Paul

[#2]

Although I appreciate it's only a few days away, we can't actually chase this up until 14/01/16, one month after you completed the redemption form.
If you've not received anything by the 14th, please let us know and we'll get that chased up for you

[#3]

Harry,
        Hi, as of 20th Jan I did not yet receive the cashback cheque in the post.
Please can you chase it
Regards, Paul

[#4]

Sorry to hear the cheque isn't with you yet.
The good news is that it is on the way to you and is now expected to arrive by 26/01/16

[#5]

Harry,
        Thanks I received it this morning
Cheers, Paul

[#6]

Glad to hear it's arrived. Thanks for letting us know