SIPP transfer from Interactive Investor to Fidelity: not going well

I initiated a SIPP transfer from II to Fidelity in February. Was tired of paying a fee for no specific added value (including an android app that doesn't show the right login screen so unusable).

For reference, the fee in Fidelity is lower, if restricting investments to ETFs rather than OEIC funds.

Fidelity also had a cashback promotion, which required a transfer to be initiated by the 5th April 2026.

Transfer still not done today (almost 4 months later).

In-specie transfer is quite standard, a few common ETFs that Fidelity does have.

The transfer was initiated properly end of February by Fidelity, but then cancelled in March by II for no reasons. They started a new transfer in April, but that was after the Fidelity deadline to get a transfer bonus.

Fidelity have confirmed that they will pay no bonus now, and that II have not been responsive.

Complained to II that, because of their mistake, transfer bonus was lost. No replies...